This issue is in our backlog, but we wanted to share a workaround that may help in the meantime. You may run into this issue if your Outlook client is logged into a different account than your Teams client.
As a workaround, when you join the meeting, make sure your Outlook client and Teams client are logged into the same account that the meeting was scheduled from.
I have the same problem - I set up a TEAMS meeting in Outlook under the default email address. I have multiple Office 365 domains. I tried joining the meeting and clicking on 'meeting options' in the calendar invite; neither worked. I was logged into the TEAMS Desktop App with the same email address / domain. Still couldn't get in. It had the right email address as the organiser BUT it had picked up another of my Office 365 email addresses as the one to let in people from the lobby and click on 'meeting options'. I had to log onto a different TEAMS instance on my phone with the other email address (not the one I used when setting up the meeting) and let people into the meeting. An embarrassing start to a very important meeting.
Meetings generated in the TEAMS APP work. It's just those created in Outlook.
It might be that I am moving between 3 or 4 different domains on the Desktop TEAMS App. I log out and log in but maybe the meeting URLs are cached in some way.
We know you are patiently waiting for this feature. This feature is being implemented in stages. Fast tenant switching is currently in testing both internally and with early customers. We expect to release to the public in the Fall. I’ll post an update once it’s rolling out.
Full multi-tenant, multi-user support will be added after fast tenant switching.
Agree with all the comments below - I need this urgently (IOS and Windows 10). In the interim, I have been using Franz which allows multiple TEAMS logons. I tried a couple of the other similar products but this is the most stable at the moment. In the short term it allows be to get round the issue BUT it's very memory hungry.
If you are logging in from a desktop/laptop you could try Franz.
I was having the same issue and this allowed multiple TEAMS logins.
One of my colleagues had issues with the voice path on a call but all other aspects seemed to work.
There are a few other solutions that do the same but this works for me at the moment.
I am still looking for the equivalent on IOS.