connexion issue

Hi,

I have a problem with my account on Teams.

I have a free account with the adress contact@oia-solutions.com.  With this adress, a partner (FITEC) invited me in their organisation, so I can get connected and I have the statut GUEST.

(if necessary one of my partners (a schoool)  created for me an account with the adress : violette.thouzeau@rocket-school.eu.)

My problem is that I can't get connected to my personal account now, I am directly connected to FITEC.

When I try to get connected on teams.microsoft.com, I got the message "AADSTS50020: User account 'contact@oia-solutions.com' from identity provider 'live.com' does not exist in tenant 'Rocket School' and cannot access the application '5e3ce6c0-2b1f-4285-8d4b-75ee78787346'(Microsoft Teams Web Client) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account."

and when I try from the app on my Surface, I can only choose "FITEC (invité)" and not my account.

Thank you !!