Hey Beat - Yes the CB User Profile is a public access published main menu item.
The 404 error seems to be gone on different plans. For example the 2nd plan
How to set boundaries
When I register for this plan it just takes me back to the home screen. It should take me directly to the payment page. Isn't that the point of CB Subs? To create a paid membership site? I'm really surprised at the number of issues here... I've built plenty of CB Subs sites before and never had these problems.
I have screenshots attached of the various back end settings. Please take a look I really appreciate it!