Manage Default Business Application access

Hello,

I have a problem restraining access to the default Business application.

I have followed the instructions available on this page:

https://www.microsoft.com/en-us/dynamics/crm-customer-center/manage-access-to-apps-with-security-roles.aspx

I checked the default app (custom) so it's not visible by all users (Hide for all roles), and added a user's role to another application B.

When I connect with this user credentials, and access mysite.crm4.dynamics.com, he still lands on the default app.

If I connect to the office portal, the user only see the other application B.

What did I do wrong? What can I do for the user to land automatically on the only business application available for him?

Thanks,

Thomas