A "destination mismatch" error occurs when the final URL in your ad does not match the actual landing page. To fix it:
- Ensure URL Consistency → The display URL and final URL must be from the same domain.
- Check Redirects → Avoid multiple redirects or URL shorteners that change the final landing page.
- Verify Tracking Templates → Ensure UTM parameters or third-party trackers do not alter the destination.
- Update Google Ads Settings → Edit the ad and re-enter the correct URL.
After changes, resubmit your ad for review in Google Ads.