You may need this out of band update.
https://learn.microsoft.com/en-us/windows/release-health/status-windows-10-1809-and-windows-server-2019#2770msgdesc
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Hello!
I have a windows server machine, sometimes when I try to log in to the computer with remote desktop I only get a black screen, the CRTL+ALT+END does nothing, and after some time the connection closes. If I open the computer via idrac othing works I cannot move the mouse, the only solution is the hard reboot. In the event viewer I have the following error: "The RDP display control module failed to change the session monitor layout. The operation failed with error code 0xFFFFFFFF."
You may need this out of band update.
https://learn.microsoft.com/en-us/windows/release-health/status-windows-10-1809-and-windows-server-2019#2770msgdesc
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Hello DominikErdei
Thank you for your question and reaching out.
I can understand you are facing with RDP of your Dell server.
Kindly have a look below settings while you taking RDP of Server.
DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth
https://social.technet.microsoft.com/Forums/ie/en-US/6e82a721-88c2-45ba-96e3-5e69afa25316/blank-screen-appears-while-accessing-ts-sesstion?forum=winserverTS
https://social.technet.microsoft.com/Forums/en-US/31b681c5-3658-45a5-8158-a0a0f967c4a2/rdp-screen-goes-black-after-successful-remote-login?forum=winserverTS
--If the reply is helpful, please Upvote and Accept as answer--
We were having the same issue and found that the solution was to update the local Security policy on the server:
gpupdate /force and log out.
Log in with the problem account.
This should then log in and display the desktop successfully.
Hope that helps.