Additional features, settings, or issues not covered by specific Microsoft Teams Free categories
Thank you for the additional information. Super helpful.
Yes, I fear the issue you had previously was due to not picking the correct account. Teams allows you to tie it with multiple accounts, and you are allowed to switch to different accounts to attend meetings. So, if you use the wrong account other than the account used to create the meeting, you could end up seeing some of the behaviors you described.
The reason I wanted to see this dropdown is to see if you have multiple accounts. Looks like your IT from old job has got that taken care of. That dropdown looks nice and clean. You are now down to your personal Microsoft account only.
If you were to attend any business user hosted meeting, and cannot join breakout room, this is normal and by default. Breakout room doesn't work for participants on personal Microsoft account, which is explained here: https://support.microsoft.com/en-us/office/breakout-rooms-troubleshooting-guide-in-microsoft-teams-02eefaa2-f5ad-4075-9de1-79747c1cb463
I screenshot the relevant section below:
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You should be able to attend job interview meeting without any issue. To give you a plan B option just in case ,you can always paste the meeting link on a web browser via incognito mode. When prompted to use the app, don't. When prompted to sign in, also don't. Then you would be given the chance to join without signing in and you just need to input your desired display name, then you would be in the meeting no problem.