Google Talk login on Mac Desktop fails

I see older issues with this but no resolution.

On the Mac desktop app, if I use any of my Google identities, the password check fails if I try to connect using Google Talk.

I managed eventually to get an option to click a link to approve access to a Google-administered university email as a login. That results in the following:

Sign in with Google temporarily disabled for this app

This app has not been verified yet by Google in order to use Google Sign In.

Any chance this can be fixed?