There's been a few guides around on how to get RDP working with Armbian so you can login from your Windows or other PC. Some solutions mentioned in various threads here were:
Install tightvncserver instead + x2go bloat (i.e. use VNC)
Only login as root - didn't seem to make any difference for me
Change some permissions of a log file in your home directory.
Well, this is what I did on my Orange PI PC running Buster desktop with Kernel 5.4, as