Hello Beth Romski, thanks for posting this in the community.
You’re seeing an “invited to join an org” message in Microsoft Teams (personal version), and the organization appears in the Switch account window. There’s no visible option to decline, remove, or block the invitation, and signing out/in doesn’t help.
To resolve this, go to https://account.microsoft.com/organizations and sign in with the same Microsoft account used in Teams. Check if there are any organizations listed under “Organizations you belong to” or “Pending invitations.” If you see the unknown organization, select “Leave” to remove it. If there’s a pending invitation, choose “Decline.”
Kind regards,
John Oli