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Fix OAuth redirect_uri_mismatch Error
Error 400: redirect_uri_mismatch
The redirect URIs are not registered in Google Cloud Console
The redirect URIs are not registered in Google Cloud Console
Your OAuth Client ID
244238220611-942pg7no5h72mgbdasbj2hl8ppsb2957.apps.googleusercontent.comFollow These Steps EXACTLY:
1
Open Google Cloud Console
2
Find Your OAuth Client ID
Look for this Client ID in the list:
244238220611-942pg7no5h72mgbdasbj2hl8ppsb2957Click on this OAuth 2.0 Client ID to open it
3
Add Redirect URIs
Scroll down to "Authorized redirect URIs" section
Click "ADD URI" and paste each of these URLs (one at a time):
1
https://prglandtech.com/GoogleCalendarCallback2
https://prglandtech.com/GmailCallback3
https://prglandtech.com/OutlookCallbackImportant: NO trailing slashes! Copy exactly as shown.
4
Save Changes
Scroll to the bottom and click the blue "SAVE" button
⏱️ Wait 5-10 minutes for Google to propagate the changes
5
Check OAuth Consent Screen
If your app is in "Testing" mode, you must:
- Add your email as a test user, OR
- Publish the app (remove from Testing mode)
After Completing All Steps
✅ Wait 5-10 minutes for changes to propagate
✅ Try connecting your calendar/email again
✅ The error should be fixed!