redirect_uri_mismatch - What is wrong with the address I'm using?

Question

When I try to access my Google calendar (via Roundcube webmail, using google_oauth2 plugin), I get this exact error:

Error: redirect_uri_mismatch error. The redirect URI in the request: http://mail.domain.com:1066/?_task=settings&_action=google_redirect&_enable=cb did not match a registered redirect URI

My webmail is hosted at this address: http://mail.domain.com:1111/RCmail/

My google project settings are as follows:

Authorized JavaScript origins

http://mail.domain.com:1111

Authorized redirect URI

http://mail.domain.com:1111/RCmail/?_task=settings&_action=google_redirect&_enable=cb https://mail.domain.com:1111/RCmail/

NOTE: directing to mail.domain.com:1111 (without the RCmail path) just redirects it to my xampp page which isn't what I want

Answer 1

Because the redirect_uri in the request doesn't match any one you register in Google sonsole. check it again, they are different:

http://mail.domain.com:1066/?_task=settings&_action=google_redirect&_enable=cb

http://mail.domain.com:1111/RCmail/?_task=settings&_action=google_redirect&_enable=cb