If the Coupert app or browser extension is blocked or not working, here are the main troubleshooting steps and solutions:

1. Refresh and Restart the Browser
- Simply close and reopen your browser, as this can fix temporary glitches that might make the Coupert extension appear greyed out or non-responsive4.

2. Check Tab Compatibility
- Ensure you are on a supported shopping site and not a browser page where Coupert is inactive; extensions may be disabled on unsupported sites or specific types of tabs46.

3. Clear App or Extension Data
- For the mobile app:
- Go to your phone’s app settings → Storage → Clear Data (or Clear Cache)1.
- After clearing, update the app to the latest version from the app store1.
- For browser extensions:
- Remove and re-install the Coupert extension from your browser's extension/add-ons store.

4. Clear Cookies and Cache (for Login Issues)
- Sometimes login or extension blockages are related to corrupted cookies.
- Clear cookies and cache for your browser (Chrome, Firefox, Safari, Edge) following standard procedures.
- After clearing, close and reopen your browser before trying again2.

5. Update Your Browser and Extension
- Make sure both your browser and the Coupert extension/app are updated to their latest versions, as outdated software can cause compatibility problems16.

6. Check for Site-Specific Blocking
- Some online stores use solutions to block coupon extensions like Coupert, Honey, and Capital One Shopping5.
- If Coupert is only blocked on specific sites (like at checkout), the site might be using software to disable coupon tools.
- There is no user-side fix if a store blocks Coupert at checkout, since this is controlled by the retailer’s website—try using Coupert on different sites instead5.

7. Contact Coupert Support
- If none of the above steps work, contact Coupert’s support team at [email protected]27. Their team can help investigate account blocks, app problems, or site-specific issues.

Additional Tips:
- Make sure you’re connected to the internet and logged into your Coupert account.
- Disable conflicting extensions that might interfere with Coupert.
- If you can’t receive Coupert emails (for password reset or verification), check your spam/junk folder or email settings3.
- For persistent account or login issues, Coupert’s help portal offers specific guides23.

Summary Table: Quick Fixes

| Problem | Solution |
|---------------------------------|------------------------------------------------------------------------------|
| App not working/crashing | Clear app data, update app, restart device1 |
| Extension greyed out | Restart browser, check compatibility, reinstall extension4 |
| Login/account issues | Clear browser cookies/cache, reset password, contact support27 |
| Site blocks Coupert at checkout | No user fix—site uses coupon blocker; try on a different store5 |
| Support needed | Email Coupert support ([email protected])27 |

Most issues can be fixed with the troubleshooting steps above, unless the block is coming from the retailer’s website, in which case Coupert cannot override the block5.