Same here! :)

I just did that, but it still does not let me join and says the same.

Edit: Now the button to join the group suddenly shows up after trying several times.

Hey, this looks really interesting! I am looking forward to trying it. I just bought you a coffee and connected BMAC to my account. Do I also need to apply to the beta to get access?

Edit: I just got the mail for the beta access without additionally applying for it. But it does not let me join the group: