Cannot acces to Dynamics CRM 2016 Online with a new security profle

Hello
I created a new user and a new security profil (copie of an standard security profile), i affected this new profil to a new user, but i cannot connect to my CRM organisation (2016 online) and i have an error message (Button Sign In currently disabled
Only system administrators or system customizers can connect at this time
Contact your system administrator if you have questions about this message).
I tried to create another new security profile that have all permission to all entities like administrator, but i found the same error message.
Anyone can help me please.