Additional meeting and call-related features and issues within Microsoft Teams for Education
Yeah, same here. Very inconsistent. Nevertheless, I did discover why the "Join" button wasn't showing up. When a meeting is scheduled using a "Group" as the scheduler and not a person with an actual mailbox, I never get the "Join" button. When it's a person scheduling the meeting, I do. I was in one such meeting today and I got the self-view box!
I never realized how critical that box is, especially when working from home. I LOVE, LOVE, LOVE the blur background feature while video conferencing. The self-view is soooo helpful to ensure you remembered to turn on blur background and that you have the camera properly positioned At such close range it's easy to get it so it's cutting part of you off without even realizing it.