Google Drive error:

400. That’s an error.

Error: redirect_uri_mismatch

The redirect URI in the request: https://<your_webNetwork_address/api/OAuthCallback did not match a registered redirect URI.

This is saying that the URI that your webNetwork server is connecting back to Google with, is not listed as an Authorized redirect URI.  This is most likely due to a case issue, when entering the Authorized redirect URI to your Google project for Google Drive.

You will want to double-check that you have correctly entered the Authorized redirect URI as:

https://<your_webNetwork_address/api/OAuthCallback