If you have selected the Allow pre-registered users only option you will have to manually pre-register the users as described below.
To pre-register a user:
In Zen Master, go to Account Management > Users.
Click +Add.
In the Name field, enter a name for the user.
In the Email field, enter the user's email. This email has to match the email registered in Azure.
Under Authentication Type, select Single Sign-on.
Click Save. The user will be created and added to the list of users. Notice that under the Single Sign-on column the status is "pending" until the user will connect for the first time through Azure.
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