Good day, a quick question: Is it now possible to access a Fritzbox WireGuard connection with the MT300N? When I take over the configuration file 1:1, the software tells me that there is a configuration error.
There are some inquiries about the problem in the forum, but somehow I don't see any solutions 
Should work without issues since WG does not have many things you can configure.
Just make sure that there is no DS-Lite or CGNAT (so no Vodafone Cable as ISP) and the networks are unique on each side.
Hello and thank you very much for your response. Yes, my mobile internet provider uses Dual-Stack Lite. What options do I have now? When I'm on the go and set up a WireGuard connection to my home with my FireTV Stick, it works as well.
P.S.: I am still a beginner in this matter. The networks are unique. The home network uses the 192.168.178 range, the MT300N uses the 172.16.8 range, and my ZTE Mobile 5G router uses the 192.168.8 range.
CGNAT is only a problem on server side.
Take a quick look here: How to troubleshoot WireGuard