When I go to another island online at Animal Crossing on my switch, I keep getting the error code 2618-0521. It says that the console can't connect to other consoles. I have a Nintendo online membership and my internet runs through an o2 homespot. I have already made calls with o2 and had a public IP address set up. My NAT type is C… In theory, should it actually work? Maybe someone knows about it here?
Activate UPnP for your switch. It may well be that it works.
Where can I activate it?
You would have to do this individually for your router. Of course, it can also be good that the switch itself has problems with the home spot. In any case, I can't recommend to gamble on mobile phones.
I just discovered that UPnP was already activated. You can't set anything specific
NAT Type C is unfortunately rather bad because he likes to cause problems. NAT B is the best I have
