Duolingo English Test Invalidated? How DET Appeals Work and What to Do Next
Seeing “Invalid” after completing the Duolingo English Test (DET) can be stressful—especially when a university application deadline is approaching.
But an invalid result doesn't always mean the same thing, and not every invalidation can be appealed.
Depending on the reason, you may be able to retake the DET, submit an appeal, or in more serious cases have your account restricted. Here's how the current process works and what you should do next.
Best Strategies & Tips for DET Speaking Questions
First: Check Why Your DET Was Invalidated
Don't immediately purchase another test.
Log into your Duolingo English Test account, open My Tests, and check the reason listed next to your result.
Duolingo currently separates broken rules into three categories:
Rule Violation: There is evidence that your testing environment may not have been secure. You may be able to retake the test if you have attempts remaining, but these results are generally not eligible for appeal.
Possible Misconduct: Duolingo says there is strong evidence that you may have received outside assistance. Your test credit expires, but you can appeal the decision.
Evident Misconduct: Duolingo determines that outside assistance was used. This can result in being permanently blocked from taking the DET, but an appeal is still available.
So before deciding what to do, identify exactly which category applies to your test.
Can You Appeal an Invalid DET Result?
Sometimes.
If your result is eligible, you'll see an “Appeal This Result” button beneath the invalid test in your account.
You have 72 hours after receiving the notification to submit the appeal. ⏰
Once you submit it, Duolingo says an appeals specialist will review your test session and send a decision to your email within four business days.
You only get one appeal for that invalid result, and the appeals specialist's decision is final.
If you don't see the appeal button, your result isn't currently eligible for the formal appeal process.
Can a DET Appeal Actually Work?
Yes—an appeal can result in the original decision being overturned, although there's no guarantee.
In a recent September 2026 student discussion, one test taker reported receiving an invalid result and submitting an appeal because important university and scholarship deadlines were approaching. Two days later, the student updated the discussion to say that the decision had been reversed and the result certified.
That's one student's reported experience, so it shouldn't be treated as evidence that appeals usually succeed.
But it does demonstrate something important:
An appeal is a genuine review process, not simply a complaint form.
Duolingo says a proctoring supervisor reexamines the test session and decides whether to uphold or overturn the original result.
What Should You Write in Your Appeal?
Keep it clear and factual.
The appeal form gives you an opportunity to provide context about what happened during your testing session. Explain why you believe the result should be reviewed and include any relevant details about your testing environment.
Avoid turning the appeal into a long emotional argument.
Instead, focus on information that could help the reviewer understand what happened. For example, if the violation involved your testing environment, explain anything unusual that occurred and why you believe it may have been misinterpreted.
Remember that the reviewer can examine the actual test session, so the purpose of your message is to provide useful context, not simply insist that you did nothing wrong.
What If You Can't Appeal?
An invalid result doesn't automatically mean you need to file an appeal.
For a standard Rule Violation, Duolingo generally allows you to test again if you still have attempts available on your test credit.
For example, your test might have been invalidated because your secondary camera moved out of position, your testing environment wasn't clearly visible, or another test requirement wasn't followed correctly.
In those situations, the best next step may simply be to fix the problem and retake the test.
Duolingo also says results that cannot be certified because of a technical issue aren't eligible for appeal. You'll need to take the test again instead.
Watch Your Remaining Attempts
This is another reason to read the invalidation message carefully.
Duolingo says that Rule Violations allow you to test again at no additional cost if attempts remain on your credit.
However, if you receive two Rule Violations on the same credit, that credit expires—even if you've only used two attempts.
Possible Misconduct works differently: the test credit expires immediately, although you may still appeal the result and purchase another credit if you're allowed to continue testing.
Don't repeatedly retake the DET without understanding what caused the previous problem. You could waste another attempt by making exactly the same mistake.
Listen Then Speak - 3 Easy Steps: Duolingo English Test
Common Reasons a DET May Not Be Certified
Many certification problems involve the testing environment rather than English ability.
Current DET rules require you to:
- keep your eyes on the screen except when typing;
- remain alone and avoid interacting with anyone;
- avoid speaking or typing until instructed;
- remove headphones and earbuds;
- close other programs;
- remove additional electronic devices;
- keep your head, shoulders, computer screen, and keyboard visible in the secondary camera;
- avoid interfering with or touching the secondary phone during testing.
Technical problems can also prevent certification.
For example, if required camera footage is missing or corrupted, Duolingo may be unable to certify the session.
Pay Special Attention to the Secondary Camera 📱
The secondary phone camera has become an important part of DET security.
Your phone needs to continuously capture your upper body, computer screen, and keyboard. If it moves far enough that these areas aren't visible, your test can be invalidated.
Before starting, make sure the phone is extremely stable. Duolingo recommends leaning it against a heavy object and notes that positioning the phone horizontally can improve stability.
Also turn on Do Not Disturb, close other apps on the phone, make sure it's charged, and check that the video feed is visible before beginning.
Most importantly, don't touch the phone unnecessarily once your test has started.
What If Your University Deadline Is Close?
This is where you need to think beyond the DET itself.
If your application deadline is only a few days away, don't assume everything will be resolved immediately because you submitted an appeal.
Duolingo says the appeal decision can take up to four business days.
If your deadline is approaching, contact your university's admissions office and explain the situation. Ask whether they can accept your English proficiency score after the application deadline or whether there are other options available.
You don't need to accuse Duolingo of making a mistake. Simply explain that your test result is currently under review and ask what the university recommends.
At the same time, determine whether you're eligible to retake the DET.
Invalid, Uncertified and Decertified Aren't Exactly the Same
These terms can be confusing.
An invalid result refers to a particular test session that Duolingo hasn't certified.
An Uncertified status on your dashboard means you've used all attempts on a test credit without obtaining a certified result. This can happen because of broken rules, technical problems, incomplete tests, or other certification issues.
A decertified result is more serious. This occurs when a result that was previously certified is later invalidated after additional security checks.
Duolingo says decertification is rare, but when it occurs, affected institutions are notified and the test taker may lose access to previously certified results.
So if you're searching online for advice, make sure you're reading information about the same type of result you actually received.
Should You Appeal or Retake?
A simple way to think about it is:
Appeal if: your account gives you the appeal option and you genuinely believe the decision should be reconsidered.
Retake if: your result isn't appealable and Duolingo gives you another attempt.
Contact support if: you don't understand the reason, believe there's a technical problem, or aren't sure what options your account currently allows.
Before You Retake the DET
If you're allowed to test again, don't rush straight into another attempt.
First, review the reason your previous test wasn't certified.
Then check your setup carefully:
Make sure you're alone in a quiet room. Remove extra devices. Close unnecessary software. Position the secondary camera securely. Keep your screen and keyboard clearly visible. Use a stable internet connection. Keep your attention on the screen, and don't speak until instructed.
The goal isn't simply to “try again.”
It's to make sure the same certification problem doesn't happen twice. âś…
Lance Graney
The Bottom Line
If your Duolingo English Test is invalidated, read the reason before doing anything else.
Some invalid results can be appealed, while others are handled through a retake. If you're eligible for an appeal, you have 72 hours to submit it, and Duolingo says the review can take up to four business days.
Appeals can be overturned, but success isn't guaranteed.
If you need to retake the test, fix the issue that caused the first invalidation before using another attempt. And when an important university deadline is approaching, contact admissions rather than assuming you have to solve the entire problem on your own first.
Prepare for More Than Just the Questions
DET preparation isn't only about vocabulary, grammar, speaking, and writing. You also need to be comfortable with the actual testing environment and rules.
When practicing with DET Study, spend some of your final sessions under realistic test-day conditions: stay focused on the screen, practice speaking only when prompted, and become comfortable completing questions without distractions.
The better your test-day routine becomes before the real exam, the less you have to think about it when your score actually matters.
Frequently Asked Questions
How long do I have to appeal an invalid DET result?
If your result is eligible for appeal, Duolingo currently gives you 72 hours from the notification that your test wasn't certified.
How long does a DET appeal take?
Duolingo says an appeals specialist will send a decision within four business days after you submit the appeal.
Can a Duolingo English Test appeal be successful?
Yes. Duolingo's official policy says an appeals specialist can either uphold or overturn the original decision. However, there's no guarantee that an appeal will be successful.
Can every invalid DET result be appealed?
No. Standard Rule Violations and technical certification problems generally aren't appealable. If you're eligible, you'll see an Appeal This Result button in your DET account.
Can I appeal more than once?
No. Duolingo currently allows only one appeal for an eligible invalid result, and the appeals specialist's decision is final.
What should I do if my DET appeal deadline has passed?
The formal appeal button is only available for 72 hours. If that period has passed, check your account to see what testing options remain and contact DET support if you need clarification.
