Additional meeting and call-related features and issues within Microsoft Teams for business
After some debugging, outlook seems to use the "default account" (under file/account settings) as the actual owner of a meeting. That means it does not go by the account/calendar (tab) you select in outlook when booking the meeting even if that is the name/domain you see in the invite.
This is a major issue. It means you can not be the administrator of meetings without going in and changing your default outlook account before inviting people to Teams meetings, and restarting outlook.