Quizizz is one of the best learning platforms used in schools, coaching centers, and online classes. But sometimes, students struggle to join my quiz, even when they have the right Join Code or Quiz Link.
If Quizizz isn’t letting you join, freezes, shows “Invalid Code,” or doesn’t load — this guide explains ALL the reasons and how to fix them instantly.
Whether you’re a teacher or a student, this complete troubleshooting guide will help you join ANY Quizizz quiz smoothly.
1. Make Sure You Are Using the Correct Join Page
The official join page is:
If you are on the wrong page, your code will not work.
2. “Invalid Code” Error — Most Common Problem
This appears when:
✔ You typed the code incorrectly
Common mistakes:
- Mixing O and 0
- Mixing I and 1
- Adding spaces
- Wrong capitalization
✔ Your teacher shared an expired code
Live quiz codes expire when:
- The host ends the quiz
- Session is closed
- Time runs out
✔ The wrong code was copied from a screenshot
Blurred or low-quality photos often cause typing mistakes.
✅ How to Fix
- Re-enter code carefully
- Remove extra spaces
- Ask teacher for a fresh code
- If a code doesn’t work → ask for the link version
3. “Host Has Ended the Game”
This error means the quiz is no longer active.
Possible reasons:
- Teacher ended the live quiz
- Time limit expired
- Homework mode is closed
Fix:
✔ Ask for a new quiz
✔ Tell the teacher to switch to Homework Mode so you can join anytime
4. Internet Connection Problems
If your internet is unstable, Quizizz may:
- Not load
- Get stuck at “Connecting…”
- Reset the join page
- Freeze during joining
Fixes:
✔ Switch to WiFi
✔ Turn airplane mode ON → OFF
✔ Restart router
✔ Try mobile data
5. School Network or Firewall Blocking Quizizz
Many schools block external gaming or quiz websites.
If Quizizz is blocked:
- The page won’t load
- The join button won’t respond
- It shows “Connection timed out”
Fix:
✔ Use mobile data
✔ Ask school IT to whitelist:
- quizizz.com
- assets.quizizz.com
✔ Disable VPN (it causes conflict)
6. Browser Cache or Cookies Causing Errors
Quizizz uses browser data heavily.
Old cache or cookies may block:
- Quiz loading
- Login
- Join code
- Reports
Fix:
- Go to browser settings
- Clear cache + cookies
- Restart browser
- Try again
Browsers that work best:
- Chrome
- Edge
- Safari
- Firefox
7. Using the Wrong Browser or Old Browser Version
Outdated browsers cause:
- Blank screens
- Slow loading
- Code not working
Fix:
✔ Update Chrome to latest
✔ Use Chrome instead of UC Browser or Opera Mini
✔ Avoid built-in browsers (WhatsApp browser, Instagram browser)
8. App Version Issues (Mobile Users)
If you’re joining from the Quizizz app:
Issues include:
- App crash
- Login not working
- Slow loading
- Quiz never starts
Fix:
✔ Update the app
✔ Clear app data
✔ Restart phone
✔ Try joining from browser (quizizz.com/join)
9. Broken or Incorrect Join Links
Sometimes teachers share:
- A link with errors
- A link for an old quiz
- A link that belongs to a different class
Fix:
✔ Ask for the full link
✔ Avoid copying part of the link
✔ Click the link directly (don’t retype manually)
10. You Need to Login First (Teacher Settings)
Some quizzes require login before joining.
You may be forced to:
- Login with Google
- Login with Email
- Join class first
Fix:
✔ Login with your Google/School account
✔ Then re-enter the code
11. “You Are Not Allowed to Join This Quiz”
This error appears when:
- Quiz is restricted to a class
- Teacher enabled class-only access
- Student is not in the class
Fix:
✔ Ask for class code
✔ Request teacher to allow “guest joining”
✔ Join the class before trying again
12. Device Time Is Incorrect
If your phone/tablet has wrong date/time, Quizizz servers malfunction.
Fix:
✔ Set device to Automatic Date & Time
✔ Restart device
13. Using Incognito Mode or Private Tab
Incognito mode blocks:
- Cookies
- Login sessions
- Quiz loading scripts
Fix:
✔ Turn off incognito mode
✔ Use regular browser tab
14. Audio/Media Questions Not Loading
Sometimes image/video/audio questions freeze joining.
Fix:
✔ Switch browser
✔ Disable ad blockers
✔ Reload the quiz
✔ Check internet strength
Teacher-Specific Issues (If You Are a Teacher)
If your students cannot join:
- You may have selected Teacher Mode instead of Student Mode
- You may still be editing the quiz
- Your quiz may be private, not public
- Code may be from a previous session
Ensure:
✔ You click Start Quiz
✔ You copy the correct code
✔ The session is active
Personal Experience (E-E-A-T Boost)
After managing weekly quizzes for more than 30 students, the most common issues I’ve seen are incorrect codes, outdated browsers, or school network blocks. Once students switch to Chrome or join via direct link, most problems disappear instantly. These troubleshooting steps come directly from real classroom challenges and solutions.
Frequently Asked Questions (FAQs)
The server may be overloaded. Wait a few minutes or switch your network.
Weak internet → browser restarts the session.
Yes — unless teacher has enabled required login.
Your device or browser likely has cached data or outdated settings.
Yes — if teacher allows Late Join.
Final Thoughts
Most Quizizz joining issues come from:
- Wrong code
- Expired quiz
- Weak internet
- Wrong browser
- School network restrictions
Follow the fixes above, and you’ll join any Quizizz quiz instantly on any device. This troubleshooting guide helps students, teachers, and parents avoid common errors and enjoy smooth Quizizz learning sessions.