Error Message: 
“Error Redirect: URI Mismatch.
The redirect URL in this request: “XXXX” does not match the ones authorized for OAuth client.”

-This error message can happen when authorizing google drive account under RS Documents Configuration tab.

How to resolve: 
If you have a custom domain setup in your org, you will need to Submit a case to support to add your custom domain to our approved list of URL’s. Please include a screenshot of the error message you received when submitting case.