I'm also experiencing this issue, after turning on advanced data protection I'm almost always unable to access the containers with the same error show in the OP's screenshot.
- signing out and signing back in does not resolve
- additionally turning Advanced Data Protection on or off does not resolve.
- attempts on multiple devices (mac, iphone) and browsers (firefox, chrome, safari) do not resolve
- clearing browser cache and cookies does not resolve
VERY occasionally (like literally once a week,) I am able to sign in following normal sign on procedures and view the private and shared containers of a production or development environment. Its really frustrating!
Here's a screenshot of the browser's console on a failed attempt to view the private container, not sure if helpful: