Missed activity in Teams is still being sent even if turned "off"

AwsAyadWe are working with Microsoft on this issue in our tenant. We have an open Technical Support Service Ticket with them. As yet, it has not yielded any additional suggestions other than noted above. I am going to try forcing a check for updates, but I highly doubt this will resolve the issue as my Teams was last updated yesterday (You have Microsoft Teams Version 1.5.00.11163 (64-bit). It was last updated on 2022-04-27).

Your observation about the 32 v. 64 bit version is interesting, but I'm curious why this would have any effect on the actual notifications received. I assume the app is being used to set the value for the notification settings, but that information is stored with the rest of my Teams data in our tenant and used by the Notifications infrastructure to determine whether to generate notification emails for me. The notifications isn't done by the app itself, so it seems strange that the different versions would generate different results. In addition, not all users in our tenant are experiencing it, so it may be the same in your tenant that you as a user aren't experiencing it, but others are unrelated to the app version.

My original suggested solution was to turn On the Notification settings (or change the frequency), sign out of Teams. Though this appeared to work for a day, it did not last and the issue persists.