Error in Power Pages on Registration, Login runtime errors
Sometimes you can get error as below in Power Pages. “Something went wrong” issue.
To troubleshoot this issue, Disable Custom Error and check the exact error.
Follow steps below.
Step 1 – Open https://make.powerpages.microsoft.com/ and select correct environment and select the power page and select 3 dots to open Admin Center.
Step 2 – In Admin Center select Site Action and select Disable Custom Error.
It will display a confirmation box and click Disable.
Once it is done, the site will be restarted automatically and check after some minutes and try to do the same scenario which was causing issue. Now you can see exact error.
hope this helps.