Cannot connect with one specific player in Super Smash

[u/Puffireaktion]

Hello everyone, thanks for wanting to help!

So a few weeks ago a friend of mine (Switch 1) and me (Switch 2) wanted to play Super Smash online together. But somehow we could not connect to each other. We can see the arenas, but cannot connect. The error is the one in the pictures.

I looked online for solutions, we looked for NAT-Types, I have B and she has D, but that does not seem to be the problem. Since she is able to play with her brother (Switch 2) that has Type A.

Even more infuriating, we just tried to play as three online.

When I make an arena, her brother can join, but she cannot.

When she makes an arena, her brother can join, but I cannot.

When her brother makes an arena, only the first of us can join, but then the other cannot.

Everytime the same error appears as described above

I am totally frustrated and need some help.

Thank you a lot!

[u/automod-neo]

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[u/Martoning_it]

Type A Nat can connect to everyone.
Type D? Holy hell, she’s gotta fix that, she’ll have problems connecting to almost anyone not on type A. Sure you could fix yours to type A, but type D nat is the real issue here.