Open your Microsoft Outlook app.
Once opened, on your settings options choose File.
On your left pane, choose Options.
After that, it will pop up setting in Options. Choose Add-ins.
Once clicked, you may see it as per below.
Click on the "Microsoft Teams Meeting Add-ins for Microsoft Office" and click the button Go... as per the image below.
Once clicked, it will show as per below. You need to tick the one same as a yellow highlighted option and click the button OK.
It will automatically enable your Microsoft Teams Meeting as per below.