Without specially crafted routes that won't fly very far ... Are you sure about the 2a00 one ?
Yep i checked it again, it is definetely a different prefix. As i said i can ping from both machines google etc.
>From the server and the PC: can you ping the IPv4 (yes v4) address of the wwan0 interface of the router ?
>From PC it works.
>From Server not working.
Are you using private IPv4 addresses on the lan?
The wwan0 interface shows me within the router only a private ipv4 the global ones are ipv6. But none of them are pingable from the server.