Duplicati User’s Manual exists, for general info. For specifics, sometimes you can use forum search tool.
How do I use Google Team Drive as backup location? might apply. I have no Google Shared Drive myself.
That’s an odd path. Is there a gmail anywhere in your configuration? One way that things sometimes get under there is if someone uses a relative path, e.g. starts talking about a gmail folder not starting from C:, but it may require Destination screen 2 Storage type dropdown at Local Folder or drive to get it.
RMB is right mouse button? Used where? You would normally left click the AuthID link to populate AuthID, using the Google Drive (limited) login, and never being asked about (or seeing) full access (which may go away courtesy of Google discontinuing it). A Shared Drive (formerly Team Drive) needs some more setup in Advanced options for googledrive-teamdrive-id, as in the link cited above. That might be what you want.