Unfortunately I’m not sure how to help, but I am able to successfully connect to my parent’s computer through Anydesk using a Wayland session on Plasma DE, so there must be something else going on.
For Linux-based devices, only outgoing sessions are supported if using Wayland. Incoming sessions are only possible when using Xorg. Furthermore, only 64-bit versions of Linux are supported at this time.
I’m using Wayland, but my parents are still using an X11 session.