Upgrade step 2 of 2 : Failed. Refresh auto-deployed services during upgrade

[ScottSumners]

While upgrading ArcGIS Server 10.5 to 10.6.1 I get this error: *Upgrade step 2 of 2 : Failed. Refresh auto-deployed services during upgrade.*  The server/site is not getting configured and I had to restore the server from a snapshot backup. Has anyone else had this issue?  My setup on this particular server is ArcGIS Server 10.5 and Web Adaptor 10.5.  arcgisserver

[RoySanderfur]

I'm going to necro this post because I had the same issue on Server 2022, upgrading from 11.3 to 11.5.

My default browser was Chrome and I was getting the error.  Clearing cache and restarting the server didn't help.

I opened the link in Edge (native version to Server 2022) and it ran with no issue and completed the upgrade.

I'm now able to access the manager in both Chrome and Edge.