Thiago Cardoso again, today with a new problem/solution example. 

customers informed a problem:

After create a user in Azure Active Directory or via office portal, added Dynamics 365 CE license to user. 

Cannot show the user on the Dynamics environment 

Cause:

org has a security group

Solution:

Add user to the group or remove the security group  on the dynamics portal ( https://port.crm2.dynamics.com/)