should just work from Plasma
but if you get a black screen you'll need more codex...
dnf install -y openh264
dnf install https://kojipkgs.fedoraproject.org//packages/xrdp/0.9.22/4.el9/x86_64/xrdp-0.9.22-4.el9.x86_64.rpm --allowerasing
cp /usr/lib64/xrdp/libxup.so /tmp
cp /usr/lib64/xrdp/libvnc.so /tmp
then install normally
dnf install xrdp
or, for reference on other dists: apt install xrdp
then copy back libxup.so and libvnc.so
firewall-cmd --add-port=3389/tcp --permanent
firewall-cmd --reload
sudo systemctl enable xrdp
sudo systemctl start xrdp
sudo systemclt set-default multi-user.target
dnf group list
Can be caused by multiple logins (The xrdp and gnome protocols only allows for a single GUI session)
Check existing logins:
loginctl list-sessions
Kill existing sessions:
loginctl kill-session c6
Try again :)