I received an o365 email notification and the call dropped that instant. I got back on the call and sent a outlook.com email back and forth and there were no issues. When your called dropped, was it from o365 emails?
If your theory is true, you could move your email accounts to another email app like Outlook then test for call drops....
No wasn’t a O365 email. Gmail accounts in stock Mail app. And yes, disabling Mail app notifications made calls dropping issue, for me, go away. Doesn’t particularly solve it either though.