Comment by ~catawump on ~cloutier/bird.makeup
I am in a similar situation, I just moved from Mastodon to Misskey and I also cannot follow any @bird.makeup accounts. Since I believe Calckey is a fork of Misskey, this is probably the same issue. The accounts are searchable and display, but upon attempting to follow it just says "Processing..." indefinitely.
This issue may also have some overlap with issue #3 "Unable to follow from GoToSocial instance" - The submitter there has done some good research into the issue and has a few comments about what the cause might be.