Connected, left organisation, how can I request to re-connect

Question

I used an email link from a Microsoft person to connect to a cross-tenant Team EXT name. After I joined, I left because I could no longer see my own tenant's teams or chats. Later, I learned about organisation swap and now want to re-join but the original email link to connect no longer works, error:

"Selected user account does not exist in tenant 'Microsoft' and cannot access the application '

Answer 1

Possible Reasons for the Error

1. Account Removal: Your guest account in the external tenant (the cross-tenant Team) may have been removed.
2. Expired Invitation: The email invitation link you used originally has expired or is no longer valid.
3. Incorrect Tenant Context: You may be trying to access the external tenant without being properly re-added or without switching to the correct organization.

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Steps to Rejoin the External Tenant

1. Ask for a New Invitation

• Contact the administrator or owner of the external Team (the external organization).
• Request them to:
  1. Re-add your email address as a guest user in their tenant via Azure Active Directory.
     1. Send you a new invitation email.
     • Accept the new invitation, and this should restore your access.

---

2. Clear Guest Access Cache

• To avoid conflicts with cached tenant data:
  1. Sign out of Microsoft Teams on all devices (desktop, web, and mobile).
     1. Clear the Teams cache:
        • On Windows: Navigate to %AppData%\Microsoft\Teams and delete all files in the folder.

          - On Mac: Go to `~/Library/Application Support/Microsoft/Teams` and delete all files.
          
             1. Sign back in and ensure you’re logged into your home tenant.
          

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3. Verify Organization Switch Capability

• Ensure you know how to switch between tenants (organizations):
  1. Open Teams (desktop or web).
     1. Click your profile picture in the top-right corner.
        1. Under Organizations, switch to the external tenant once you’ve rejoined.
        • If the external tenant doesn't appear, it means your account hasn't been re-added to that tenant.

---

4. Check Azure AD Guest Access

• If you're a tenant admin, check Azure AD in your home tenant:
  1. Go to the Azure AD Admin Center.
     1. Check for guest accounts under Users > External Identities.
        1. Ensure that cross-tenant access settings allow invitations.

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5. Test Access with an Alternate Browser or Device

• Sometimes, cached authentication tokens can cause issues. Try:
  • Opening the invitation link in Incognito Mode or a different browser.
    • Accessing Teams on a different device.

---

6. Verify External Tenant Access

• Contact the external tenant administrator to:

1. Confirm whether your guest account still exists in their directory.
2. Check their cross-tenant access settings in Azure AD to ensure they allow guest users. Possible Reasons for the Error
   1. Account Removal: Your guest account in the external tenant (the cross-tenant Team) may have been removed.
   2. Expired Invitation: The email invitation link you used originally has expired or is no longer valid.
   3. Incorrect Tenant Context: You may be trying to access the external tenant without being properly re-added or without switching to the correct organization.
   Steps to Rejoin the External Tenant 1. Ask for a New Invitation
   • Contact the administrator or owner of the external Team (the external organization).
   • Request them to:
   1. Re-add your email address as a guest user in their tenant via Azure Active Directory.
   2. Send you a new invitation email.
   • Accept the new invitation, and this should restore your access.
   2. Clear Guest Access Cache
   • To avoid conflicts with cached tenant data:
   1. Sign out of Microsoft Teams on all devices (desktop, web, and mobile).
   2. Clear the Teams cache:
      • On Windows: Navigate to %AppData%\Microsoft\Teams and delete all files in the folder.
      • On Mac: Go to ~/Library/Application Support/Microsoft/Teams and delete all files.
   3. Sign back in and ensure you’re logged into your home tenant.
   3. Verify Organization Switch Capability
   • Ensure you know how to switch between tenants (organizations):
   1. Open Teams (desktop or web).
   2. Click your profile picture in the top-right corner.
   3. Under Organizations, switch to the external tenant once you’ve rejoined.
   • If the external tenant doesn't appear, it means your account hasn't been re-added to that tenant.
   4. Check Azure AD Guest Access
   • If you're a tenant admin, check Azure AD in your home tenant:
   1. Go to the Azure AD Admin Center.
   2. Check for guest accounts under Users > External Identities.
   3. Ensure that cross-tenant access settings allow invitations.
   5. Test Access with an Alternate Browser or Device
   • Sometimes, cached authentication tokens can cause issues. Try:
   • Opening the invitation link in Incognito Mode or a different browser.
   • Accessing Teams on a different device.
   6. Verify External Tenant Access
   • Contact the external tenant administrator to:
   1. Confirm whether your guest account still exists in their directory.
   2. Check their cross-tenant access settings in Azure AD to ensure they allow guest users.