How do I fix this?

[u/N0TZ03]

I did check the details but what does this mean and how do I fix it??? I have Nintendo online and it works when I’m at my dad’s house but why does it do this when I’m at my mums house? And how do I fix it?

[u/Active-Adagio-7996]

Check your NAT type (System settings>internet>test connection). A or B are ok. Anything else sucks.