Since an upgrade, accessing the KDE interface via Anydesk no longer works. Anydesk reports among other things “Wayland is not supported”.
Anydesk is a client/server solution that uses an internal protocol. So it is explicitly not meant to be a remote X server or similar!
Anydesk is not part of the distribution, so the customer has to contact the support of Anydesk. There is no solution from Univention support here.