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Hi I ran into the same issue on Debian testing and opened a bug on the Debian bug tracking system (Debian bug 862089) 

xrdp Problem on debian - black screen

[SOLVED]
I got the same error in CentOS 7.5 with Xfce desktop I had struggled for several days with no result Recently I found a solution coincidentally 

xrdp VNC Problem connecting

Change the last line of your sssd.conf to
access_provider = simple
AD logins will work  then Access_provider =ad needs some more configuration 

xrdp xrdp, no login for AD users.

I'm still getting this error in Ubuntu 20.04 - blank screen - no other significant errors in the logs I am found the solution 

xrdp Black screen - Closed socket 19 (AF_UNIX) error

@sprnza created #7283 to allow listing of scancodes and VK_* names that might be helpful here 