Can I release ports via router access points?

I have a Vodafone station at home. On this I wanted to release 2 ports for a Minecraft server. However, our Vodafone station does not have this option. That's why I wanted to know whether I can simply connect our old FritzBox as an access point to the station and release the ports there.

I wanted to do the same thing in the past, but I also have a Vodafone station. Don't ask me how often I freaked out because of my Vodafone station (topic ports). You can of course use your FritzBox. But opening ports is… Not safe because you have to turn off your firewall so that others can access the server at all. And if you also buy or use a domain that is supposed to cover up your IP address, it doesn't help because you simply e.g. Enter in the Windows command line or in the Linux terminal (ping your-domain.net). And then you have your IP address. I don't think a VPN would help either. Your network would be a good target for hackers if your firewall is off. But hey do what you want As long as not everyone knows your domain or your IP.

No, that doesn't work. The ports must be opened on the router. He manages what is allowed out and in.
If you could see whether the Vodafone station can now be used as a bridge, i.e. Only modem. I just don't know what the current status is. Then your Fritzbox could work properly as a router and open ports.

Alternatively, take the rental Fritzbox from Vodafone or buy your own that is suitable for the connection.

If the whole thing is only going to work for a fixed circle of friends anyway, services like Hamachi would also come into question.

I have now released the ports, connected a laptop to the Fritz Box via LAN, started the server but my friend still can't join.