AVM tries to convince you to use their MyFritz service or another dyndns provider to use the new Wireguard
VPN which the new Fritzbox software supports.
Since I have a static IP and my own domain pointed to it, I have one of the use cases where a dyndns should not
be required. Perform the following workaround to enable Wireguard:
Go to the Dyndns settings and activate the use the following settings:
Use DynDNS: checked