The affected user has no license in SharePoint. The user cannot create SiteCollections or be added in group-memberships, for example. 

You can proof the license-status under the  Admin Center in the Users menu.

Solution:

To use the unlicensed user with the Collaboration Manager 365 you need an deposited email-address in the user profile. After you add an email-address can use the Collaboration Manager with no restrictions.

You can add the email address in the SharePoint Admin Center -> user profiles -> work email. You must save the change.