Je ne peux pas me connecter au Teams en tant qu'invité, je reçois une erreur AADSTS50020

Question

J'ai un compte Ms personnel, j'ai été invité à rejoindre le Teams d'une organisation externe à la mienne en tant qu'invité mais quand j'essaie de m'y connecter avec le lien qui m'a été envoyé je reçois l'erreur

Message: AADSTS50020: User account 'xxx' from identity provider 'live.com' does not exist in tenant 'XXX' 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.

Answer 1

@Olivier Terrier

The error is occurring because you're trying to use a personal Microsoft account (associated with live.com) to access a Teams tenant that expects an account already registered as an external (guest) user. In other words, the Teams instance belongs to a tenant that does not recognize your personal account; it needs to be pre-added as a guest user before you can sign in.

Here’s what you can do:

1. Confirm with the inviting organization: Ask the administrator of the organization that sent you the invitation to verify that your personal account (your live.com address) has been properly added as a guest in their Azure Active Directory. They may need to resend the invitation or check the guest configuration.
2. Ensure you’re signing in with the intended account: If you have both a personal account and an organizational account that has been added as a guest, make sure you’re signing in with the correct one. The error message indicates that the signed-in account isn’t recognized in their tenant.
3. Use an incognito/private browser session: Sometimes, cached credentials cause conflicts. Try opening the invitation link in an incognito or private window so that you’re prompted to sign in with the appropriate account.

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