Start Session and End Session Events not firing

I created a start session and end session test to run on my iOS application, but the events are not firing. I’ve read what qualifies as a started/ended session, and the criteria is being met; however, those events will not fire at all. I have other tracking running on my application that works perfectly fine, but I can’t seem to figure out why it won’t for start session. If anyone knows why this may be happening or can think of a work around, that would be fantastic. Thanks!