To briefly summarize our issue, after federating our ArcGIS Server (10.9.1) with our on-premise enterprise portal we are unable to access the ArcGIS Server Manager, or Secure REST services.
f I try to login to ArcGIS Server Manager I am presented with the server login screen but am never able to authenticate (sits at Please wait....)
If I try to login to the REST endpoint, the URL I can see in the browser developer tools is something like https://servername/arcgis/login?ReturnUrl=https://servername/arcgis/rest/services, which seems to just loop back to itself briefly..
Any insights or assistance on this matter would be greatly apprectiated!
Joshua Murphy