If I try to respond to this comment, I get the language not allowed error:
https://kbin.social/m/[email protected]/t/263669/-/comment/1189646
I checked my lemmy.world account settings through my web browser, and see that my language is set to Undetermined, which I thought was the fix for this.
So I checked again, and I had both Undetermined and English checked. I didn’t know I could have more than one. I unchecked Undetermined (left English checked) and it worked!