As we all know, you are not allowed to ask question in the Apple Support Community if it's related to a beta. The mods delete it immediately. That being said, I'm having the same issue. In beta 1 and beta 2. I can log into 2 devices, but the 3rd and 4th fail. I tried different devices this time, but after the 2nd login it starts failing on the last 2. I think they put some limit on it.
Moebis
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
Very, very gradually. Seems like only a very few got access, the rest are in a holding pattern. Apple still hasn't fixed Universal Control and that is going on 3 years. I have little hope for Image Playground, it will be something Apple announces and then forgets and lets languish. Doesn't really matter as there are a ton of much better AI image generation tools out there. I don't really have a use case for generating cartoons and gen-moji, whatever that is.... sounds gimmicky.