Additional sign-in or account-related issues within Microsoft Teams for business
Hello Georgette Lynn,
Thanks for your post in Microsoft community. Due to our Privacy policy, we had removed your personal information from this thread.
Based on your post, we understand that you have received meeting invitation and when you try to join Teams meeting as a guest user, you get this error message. Given this situation suggest you to kindly ask the inviters to check if they have added you in such Teams as a guest user or added you as a guest user from Azure Active Directory side.
- To check this: Go to Azure Active Directory portal > Users > Check you are added as a guest user or if you are not there, ask them to added your user account as Guest user and then check the result.
Also ask them to verify, if the inviter send meeting request to you as guest user or external user? Inviter side have to enable Guest access and External access from their end. They can check this settings from Teams Admin center > Org-wide settings > Guest and External access.
Thanks and regards,
Ankita Vaidya