Created a lemmy instance but can't post comments on other instances

Hello, I set up my own lemmy instance and it can't comment on other instances. on the apps it gives me a language not allowed, on desktop the post button just spins eternally. And idea how I can fix this?

Edit: I've tried setting my language to undetermined, english, everything all at once - both for the user and the server itself. None of them work. Votes work though, I can upvote and downvote whatever I want and it shows up fine.

Edit2: I switched to a different domain and it works fine now. I think maybe something to do with the fact I am using this to learn so I had it up for a few days before i broke it all and maybe the other servers are like "wait that's not the same" or something. idk. i'm happy now either way.