Cannot follow accounts on birdsite.monster
birdsite.monster is a service to allow you to follow Twitter users without requiring someone to manually setup a bot/mirror/feed of their posts. Trying to follow users seems to fail. The user is fetched, their profile is populated on your instance, but the follow request is never ACK'd and you will not receive their posts.
Attached is a log of me trying to follow a user. I haven't been able to identify any issues here, so perhaps it's a problem with their AP implementation.