This sort of leads off from #976 (and my comment there #976 (comment)), but currently OAuth profile information is only retrieved on first sign up when using fider, but never again.

A user may change their name or email through the OAuth provider (in our case, custom SSO), and this then becomes out of sync in the fider instance.

This information is already available to fider (as we provide a Profile API url when setting up OAuth), so I imagine this can be done by making a request to the API on a new sign in, retrieving the relevant information, and automatically patching the current user information with this.