New feature in 12.6 - Permission Groups

After a recent upgrade to 12.6.0, some users were not able to log in, getting an error message "Error. Sorry, there was an error : unauthorized_client. Request Id: 0HMSA0GDGEDP2:0000003C".
It didn´t happen to the users with Admin license.

So we´ve realized that in the Subscription Hub there was a new setting which was empty - Permission Groups. So we have created one such group and assigned some of the users (including the one that has received the error) to the group.The user was able to log in successfully.

However, some other users which got the error, were then able to log in without any issues, even though thery were not assigned to any Permission Groups. This applies to both the users with Board authentication as well as the users with a Single Sign-On enabled.

Does anyone have some further experience with this and could share what should be configured for a basic setup (no API)?

Answers