Seeing the same behavior in 9.1. Verified Analytics Client Id and Secret and receiving prompt for allow permissions (so I have internet access and correct URIs in Google Console), then back to the Configure Analytics page. After some searching came upon a few articles that sited the missing configurations. But, creating a new project did not yield the DashboardPermissions.config, nor did attempting to register it yield any different results.
Is this a bug or configuration issue? Is there another documented work around?