im having an issue logging in to client provided organizations on the authenticator app

Hi @Nicole Vento,

Thank you for your detailed response.

The information you shared is very helpful and will support future troubleshooting. That said, I’d like to highlight a few key requirements for your account setup to work properly, and I’d love to understand which scenario applies to you.

Let’s assume your primary account is Account A. Below are two possible scenarios you might be dealing with:

Scenario 1: Account A is used as a guest account in their separate clients.

In this case, you’ve shared your Account A email with both clients, and each client has invited that account as a guest user into their organization. This results in two guest accounts: A1 and A2, created by each client.

To activate these guest accounts:

• You should receive invitation emails in your Account A inbox.
• You must accept the invitations to complete the setup.
• Once accepted, you’ll be prompted to sign in and set up MFA (Multi-Factor Authentication) if required by each client.

So I'd recommend you to confirm:

• Have you received invitation emails for Account A from either client?
• Have both tenants successfully added Account A as a guest user?

These details will help determine whether the login loop is caused by missing permissions or an incomplete guest setup.

You can read about how this work via this article: Quickstart: Add a guest user and send an invitation - Microsoft Entra External ID | Microsoft Learn

If you're in this scenario, your clients' IT administrators will need to assist by revoking the MFA sessions for the guest accounts (A1 and A2) associated with your primary account.

They can do this by accessing Microsoft Entra ID and locating your account under the Guest Users category. From there, they can revoke the session to reset the authentication flow and allow you to reconfigure MFA.

Click into your account and revoke your MFA session:

Scenario 2: Your clients created new accounts for you in their tenants

In this case, each client has provided you with a separate account. Let’s call them Account B (@theircompanyB.com) and Account C (@theircompanyC.com).

If you're unable to add these accounts to the Microsoft Authenticator app, the issue may be related to multi-factor authentication (MFA) setup.

To resolve this, the IT administrators from each client organization will need to revoke the MFA sessions for those accounts. They can do this through the Microsoft 365 Admin Center, which will reset the authentication flow and allow you to reconfigure MFA properly. following this article: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |…

I understand it's complicated when it required both IT admin from your clients' sides to be involve in this issue, but following these scenarios will ensure you have access with these 2 accounts. 

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.  

Thank you for your patience and your understanding. If you have any questions, please feel free to reach out.  

I'm looking forward to your reply.

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