Using Outlook for Android in business environments for email and scheduling
I came across another way to re-add the Outlook notification sound back for Android users.
ON PC:
If you have Outlook on your PC navigate to - This PC > OSDisk(C:) > Windows > Media. There will be a .WAV file called Windows Notify Email.wav. *Feel free to open it to confirm its the desired tone*
Save this to your One Drive or Google drive.
ON PHONE:
On the Sound setting within Notification category on the phone app hit the "Currently Set" tab. At the bottom right there is a (+) button, once you hit that, it allows you to search your One Drive / Google Drive for sounds/tones. Navigate to where you copied the .WAV file and load it. It will populate as one of "My Sounds"
Hope this helps anyone who is still looking for a solution.
Cheers,