ArcGIS Data Store stuck in configuration

[WongChunKang]

After installing ArcGIS Server and Portal for ArcGIS 10.9.1 on a single machine, the installation of ArcGIS Data Store (also on the same machine) is now stuck in the configuration page where it says "Please wait while the ArcGIS Data Store is configured...". I have been waiting for hours to no avail. The browser developer console also did not reflect any error. I have tried reinstalling ArcGIS Data Store and removed the old C:\arcgisdatastore folder but it did not work.

What can I do?

Update: If you encountered the same issue, first unfederate your server site from your portal first (removing-an-arcgis-server-site-from-your-portal), then try again. It worked for my case. 

[Scott_Tansley]

Progress?

[WongChunKang · Accepted solution]

After hours of waiting, it displayed the message: "Could not connect to server on machine. ArcGIS Data Store or GIS Server on that machine may not be running or the machine is not reachable at this time.", despite the fact that the server was running perfectly and I could access the server manager site just fine.

But somehow the ArcGIS Data Store finally configured successfully after I unfederated the server site from the portal using Portal Administrative Directory. 

[Scott_Tansley]

Ah that little chestnut.  You have to add the data store to the server, then federate, then designate it as hosting.  There’s an order.  But you’re now sorted.