To access to Revit Server Admin, you have to use an old fashioned Internet Explorer with silverlight.
Silverlight is dead since many year, and Microsoft will stop the support next year :
https://support.microsoft.com/en-us/windows/silverlight-end-of-support-0a3be3c7-bead-e203-2dfd-74f0a...
Can we have a new interface witch works with any recent web -navigator (chrome, firefox, edge, opera) ?
The cheer on the cake will be creating backup schedule from this interface (every any user synchronization). Scripts to backup is painful !