I am the meeting organizer, but Teams will not allow me to access Meeting Options

I think the fact that the Teams client doesn't allow more than one enterprise O365 account is an indicator of the root of the problem.

Microsoft assumed people will only ever use Teams with one and only one enterprise O365 account. So, the Outlook add-on just assigns the meeting organizer based on the account you've used to log in to the Teams client, rather than the account/calendar where you create the meeting in Outlook. The weird thing is that the correct account shows up as the organizer when you view the meeting in the Teams client, but it tells you you're not the organizer if you try to change settings, and it won't let you start the call. This has led to many frustrating experiences for my customers, and is not a good look.

In the end, I uninstalled the Teams client. I use teams only from within Edge. And I create calendar meetings only from within Teams within Edge. Until they fix this bug, it's the safest way to avoid having a meeting with all of your clients waiting and you can't start it.