Outlook for Android Double Notifications

This has been a problem for quite some time that I've had on two different Android phones both with the Outlook app and Android 8 (Oreo). The problem is I get double notifications (the sound part of a notification) for EVERY email that arrives on my phone. On top of that, notifications are often delayed by minutes or hours and then all arrive in a stream of double notifications. People ask me what's wrong with my phone when it starts dinging for 20 seconds (it doesn't help that I have Mario themed notifications so it sounds like I'm on a real coin streak :)).

All other apps on my phone work properly - it's only the Outlook for Android app that causes this. This is a widespread issue with little or no real solutions to it out there that I can find. Everything seems to point to it being an Outlook issue, not an Android issue. 

I've discovered that if I close the Outlook app on my phone (remove it from recent apps), then the double notifications stop. But as soon as I open the app again then they start again until I remove it from recent apps. 

My phones that have had this problem are the Nexus 5X and now I have a OnePlus 5T. Both vastly different devices but the common thread is Android 8 and Outlook. 

Please confirm that this widespread issue is in the queue for being fixed and provide a timeline for when I can expect my double notifications to stop. Fixing the delayed notifications would be great as well although I don't know for sure that's an Outlook problem.