Groups are not synched into Stream

Albert Clawson - It sounds like there is some sort of issue going on with your environment where Stream isn't syncing the list of O365 Groups correctly. A group you created in Teams should show up, and deleted groups shouldn't be there. I'm so sorry you are running into this problem.

Can you open up a support ticket? They'll help you get all info we need to investigate. If support needs more help they can easily escalate up to us in the engineering team for deeper investigation.