In order to fix this issue you must login to a workstation as a domain administrator.
open regedit as administrator.
click connect to remote registry and put in the servername of your server
browse to this branch and change permissions to give full control to your administrator account
And then delete the L$RTMTIMEBOMB key. Restart the server or RDP service on the server and now you have another 120 days to either uninstall session host service or install RDS licenses and the license server.
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