Have you updated your project recently? It is possible that during upgrade you have omitted to update the Telerik.Sitefinity.Analytics.xap file part of the ClientBin folder. If this doesn't help you can delete from your App_Data/Sitefinity/Configuration folder the AnalyticsConfiguration.config and DashboardPermissions.config files which will reset your Sitefinity application.
Please get back to us if the problem persists.
Thanks for sharing your experience.
We'll investigate why this happens anyway.
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?