Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hello Jessica, this is Suganya. I'm happy to assist you.
It seems that in some cases when you are unable to leave an organization because your account is locked, you may need to contact the tenant admin to have them delete your account. However, in this case, since the company is no longer operating, it may not be possible to have the account deleted.
One potential solution could be to try and hide the org from the list. In Microsoft Teams, you can hide an organization by clicking on your profile picture and selecting "Settings". From there, you can navigate to the "Accounts" section and toggle off the switch that says "Show organizational switcher".
I hope this helps you to resolve the issue. Please let me know if you need further assistance. Thank you!
Regards
Suganya