Email notification sound/pop up on phone call

[Mojave]

Galaxy S9+ on Pie. No problems until about 2 days ago. When I am on a phone call and all of a sudden I am receiving a notification sound and a pop up notification for an incoming email. I went into my phone's setting...call alerts and ringtones....and all my call alerts are turned off including the "notify during calls". I have not changed any settings since the Pie update in my phone settings or in my email settings. I don't want any type of notification/sound while on a phone call. Any help would be appreciated. Thanks.