Hello, I just spent like 5 minutes trying to figure this out and figured this might be a common question, so just posting the answer here for posterity. If PieFed hasn’t seen the community before you can add it by navigating to Topics -> All Communities -> Add Remote Community.
It seems like unseen communities don’t automatically get added when you try to migrate your user JSON, so be careful to add any remote communities that are missing.
Awesome! I’m moving from Lemmy and I just created my account, and installed Interstellar, so I’m still figuring things out.
I was adding all my lemmy communities and couldn’t find half of them. So thank you for this!