Switch Friend Unable to Join Online Switch Game

Silentriver

Newcomer
I have one friend who is absolutely unable to join me or my gfs world. The world shows up but whenever they join they get a NAT error code (2618-0513) and are unable to join. My gf and I have been able to play together perfectly fine, but my friend can’t join either of our worlds at all, and we both can’t join theirs, the same error code pops up. One thing we thought it might be the fact that me and my gf have the same ISP but the friend has a different one, but other than that I have no idea what could be the problem since all of our NAT types are the same (NAT B), our internet speeds are fast, we’re on the same version of stardew. What should we try next?
 
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