Method1 - Trying to login using an unauthorized "guest" user
-Create a guest user - user1
-try to login in admin interface using the guest user (user1)
-We are unable to do so, because of a "401 - unauthorized" - ok, this is expected
-Right after, try to login as admin

Here we have an infinite spinning wheel and in the browser developer tools the error

TypeError: this.get(...).one(...) is null[Learn More]  _ezcombo:717:37

*More details*

The first call ends up on a JS error with message 'Failed to load root locations'

When trying to login with admin account, every server return are correct but UI fails.

You can validate that by reloading the page, you will be log and dashboard directly