This led me on the correct path. My internet provider uses so called CG-NAT which means that I share a IPv4 with other people and thus can't connect via v4. Using IPv6 solved the issue.
One can figure this out by looking up the connected IP address in the terminal: "curl ifconfig.me"
it gave me a IPv6 instead of a v4. Check again with your IPv4: "curl -4 ifconfig.me". If it gives you a different IP than your router shows for your device on the routers website you have to use IPv6.
For windows users, much luck getting to know your ipconfig i guess
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