Hi Ezra,
Thanks for your post on the community forum. I'm Nik, an independent advisor here to assist you with this.
As per the description, I understand that you want to stop the email notifications from Teams. If so, you could turn off email notifications by these steps:
Select profile pic icon > select Settings > Notifications > Email sectio, Turn off "Missed activity emails".
Now, manually restart the app by right-clicking the icon in your taskbar (Windows) and selecting Quit. Click the app icon to open it again.
Please let me know the outcome, and I'll further look into this.
Regards
Nik