I am getting Invitation Redemption Error after being prompted to switch to invited email address

Ask the inviting organization’s Microsoft Entra administrator to inspect your guest record and, if it was redeemed with or is bound to the wrong identity, reset its redemption status and issue a new invitation.

Because the failure occurs on Android, desktop, and private browsing, repeating cache removal, reinstalling Teams, or signing out locally is unlikely to change the server-side guest identity.

Administrator-side fix

A Helpdesk Administrator or User Administrator in the organization that invited you should:

1. Open Microsoft Entra admin center → Entra ID → Users.
2. Find the guest account using the exact address that received the invitation.
3. Record:
   • Invitation state—for example, pending or accepted.
   • The guest’s stored Email, Other emails, and sign-in identity.
   • The complete error/AADSTS code, correlation ID, and timestamp from the failed redemption.
4. If the guest record shows the wrong redemption identity or was previously redeemed against the wrong account:
   • Open the user’s Overview tab.
   • Under My Feed, in the B2B collaboration tile, select Reset redemption status.
   • Select Reset to resend the invitation.
5. Only if the guest should redeem using a different address:
   • Select Edit properties.
   • Update Email and add the intended address under Other emails.
   • Save, then reset the redemption status.
6. Open the newly generated invitation from the mailbox that received it and sign in with that identity.

Resetting redemption preserves the existing guest object ID, group memberships, and application assignments; deleting and recreating the guest is therefore not the first choice. Microsoft documents Helpdesk Administrator as the least-privileged role that can perform the reset.^1^

Why the other address appears

If both addresses appear in Manage how you sign in to Microsoft, they may be aliases of one personal Microsoft account rather than two accounts. Aliases share the same password, contacts, storage, subscriptions, and account settings, so signing in with either alias opens the same underlying account.^2^

That is different from having a personal Microsoft account and a Microsoft 365 work or school account with the same sign-in address. Those account types cannot be merged, although they can coexist.^3^

Do not remove an alias merely to troubleshoot the invitation. Alias removal changes the Microsoft account itself and is unnecessary if the Entra guest record is what is bound incorrectly.

If the reset does not resolve it

The inviting administrator should use the exact AADSTS error, correlation ID, and timestamp to distinguish these cases:

• Email and UPN differ: An invitation sent to a non-UPN email can be redeemed through the original email invitation, but later sign-ins may fail unless email is enabled as an alternate login ID. The administrator should verify the invited email against your actual user principal name (UPN) and, where appropriate, reinvite the UPN.^4^
• Duplicate proxyAddresses value: In Microsoft 365 admin center, search the invited address under:
  1. Users → All users
  2. Users → Contacts
  3. Teams & groups → Active teams & groups
  If another user, group, or contact owns that address, merely locating it is not enough. The administrator must remove or change the conflicting address; Microsoft specifies using Microsoft Graph when removing it from the relevant user or contact object. The guest can then be invited again.^5^
• Federation or external-collaboration policy: The error details may show that the home tenant has blocked email-verified users, the account is absent from a federated domain, or the inviting tenant restricts external collaboration. The relevant tenant administrator must correct that policy or identity state.^5^

Message to send the Teams owner

Please forward this to your Microsoft Entra Helpdesk Administrator or User Administrator. My Teams guest invitation fails at Switch with “Invitation Redemption Error” on multiple clean clients. Please inspect my guest record under Entra ID → Users, verify the invited email and redemption identity, and, if it was redeemed or bound to the wrong identity, use Overview → B2B collaboration → Reset redemption status and resend the invitation.
Invited address: [address]
Failure timestamp and time zone: [timestamp]
AADSTS/error code: [code, if displayed]
Correlation/request ID: [ID, if displayed]
Screenshot attached.

References

1. Reset guest redemption status - Microsoft Entra External ID
2. Change the email address for your Microsoft account | Microsoft Support
3. Which account do you want to use? | Microsoft Support
4. Microsoft Entra B2B collaboration FAQs
5. Troubleshoot B2B issues - Microsoft Entra External ID