Must be very challenging to develop for the Fediverse.
Yeah, it certainly can be for sure :) You never know what the issue is. It's especially tricky where you are targeting three different types of servers (Mbin/Lemmy/PieFed) like we are. The main problem is that I am primarily using an Mbin account with Interstellar, so it usually takes longer before issues are found for Lemmy or PieFed.
Since you mentioned Lemmy having problems with DMing as well, I have added that to the issue as well.
You are not able to do this action due to being a very new account or because of a low reputation.
Must be something piefed.zip setup, for spam prevention?