The error message "Not Authorized" will appear when a user either doesn't belong to a Usergroup via a manual assignment or auto assignment, or in the case they are a member of a Usergroup, the Usergroup doesn't have a Role Document setup.
To confirm this navigate to Setup -> Admin -> Usergroups and navigate to the Users tab you should find that the User doesn't belong to a User Group denoted by the User Groups column (will not have a value present).
Alternatively the User will belong to a Usergroup, but the Usergroup won't have a Role Document/Flex Org assigned currently similar to the below:
Note: When undertaking the resolution steps below, you may encounter a 10 minute period where the change isn't reflected in the platform. This should clear after 10 minutes of the user being signed in.
Resolution steps: User not assigned to Usergroup
To resolve your user not being assigned to a Usergroup you'll need to ask a CloudHealth Administrator to do the following:
Resolution steps: Usergroup missing assignment
If your CloudHealth Administrator determines that you do belong to a Usergroup it is likely the Usergroup doesn't have a Role Document/Flexorg assignment. In order to verify and resolve this follow these steps:
Once the Usergroup has been set as per the above the user will no longer receive the "Not Authorized" error when accessing the platform.