Hello @David-TP 

Thank you for your Replay

regarding TKID260221657 it will not work as I expected :-( here the answer from the German Support

Der TP-Link M8550 unterstützt keine eingehenden VPN-Verbindungen über IPv6 auf der WAN-Seite. Der integrierte WireGuard-VPN-Server dieses Modells benötigt eine öffentliche IPv4-Adresse, um aus dem Internet erreichbar zu sein.

In Ihrem Fall stellt Ihr Mobilfunkanbieter Folgendes bereit:

• Eine private IPv4-Adresse (10.x.x.x – CG-NAT) → diese ist aus dem Internet nicht erreichbar

• Eine öffentliche IPv6-Adresse → jedoch unterstützt dieses Modell keinen VPN-Serverbetrieb über IPv

regarding the Issue that "I can't make a connection to my home network" it's also very simple. The  M8550 don't accept my config file from my Fritzbox because of my Home network IP 192.168.0.0/24 If I change it to something else e.g. 192.168.2.0/24 I can import the Config. This has been verified by @Maxx2112 see

https://community.tp-link.com/en/home/forum/topic/842696?replyId=1665954

Long-term I may change may Home network address and give it a other try, but for sure not the next 3 to 4 months.

regarding your question:

> By the way, do you wish the VPN clients on M8550 could only access certain local servers on the Fritzbox, not the whole LAN network or external internet connection?

I need to access the or external internet with a German IP and I don't want use a public VPN-Server.

Overall the M8550 is a very nice router, easy to take around and I can use it without battery installed. For me, 5G is nice to have, but I don't really need it.

But the whole VPN stuff ist not working as I expected, and therefor, just as a simple mobile hotspot, the M8550 ist far to expensive. I wouldn't by it again :-(

Sorry,

very best regards

CW56