HI
“RDS is in general working fine and until 3 weeks ago, so was our printing. ”
1.we can run below powershell command on issue RDsession host server then check which update patches we installed before 3 weeks ago.
$QFE = Get-hotfix -computername $server | select-object -property Description,HotFixID,InstalledBy,InstalledOn | out-file c:\windows\temp\$server.txt
change $server to hostname
2.what's the issue printers model ?
3.If you print "test page" on both printer server and session host server respectively, do they all cannot print and print jobs stay in queue?
How to Print a Test Page in Windows
https://www.dell.com/support/article/sg/en/sgbsd1/sln153411/how-to-print-a-test-page-in-windows?lang=en
4.which printer policy did you use ?
did you deploy printer policy on printer server by using “the users that this GPO applies to(per user)” or “the computers that this GPO applies to(per machine)” like picture ?
did you deploy printers from printer server to both client win10 computer and RDsession host server ?
5.if we install the latest update on one of issue session host server,will can not print issue also happen on this RDsession host server ?