Help: Outlook for Mac missing Teams Integration

I have Outlook for Mac; I use it for work (I also created other profiles so I use my personal emails here as well). Till recently, it was working just fine. Then yesterday, I tried to create a meeting event with an MS Teams link but the MS Teams toggle button was not there; it was gone. I could not add a Teams link for the meeting.

I have admin access to my Mac.

I restarted my Mac, it didn't work.

I have already uninstalled Outlook and Teams and reinstalled them; didn't work.

I have tried to access the "Get Add-ins" button but it's grayed out. 

I have tried to go into "Outlook > Preferences" but I can't find "Preferences" in the Outlook menu.

I have deleted all profiled and just tried with my work profile, still no success.

I've spend way too much time on this with no success; any other ideas or suggestions?

Thanks in advance.