I am using Canvas (student) on my iPhone 6, IOS 12. I have push notifications enabled with the sound toggled on in the Canvas notifications settings on my iPhone. When I get a push notification from Canvas, there is no sound. All other aspects of receiving notifications are ok. I have submitted three tickets to Canvas Support and have yet to get the issue fixed.
I have deleted and reinstalled Canvas.
I have deleted the Canvas for IOS access tokens on my browser before reinstalling Canvas on my iPhone.