My app canceled by Guideline 2.5.4 - Performance - Software Requirements, although I have done well

In my app i use AVPlayer to be able to enter Picture in Picture mode in my video and it works great, but for some reason my app got canceled anyway because of this reason, i want to know what i did wrong

Guideline 2.5.4 says:

Multitasking apps may only use background services for their intended purposes: VoIP, audio playback, location, task completion, local notifications, etc.

How do you use background services ?

My app canceled by Guideline 2.5.4 - Performance - Software Requirements, although I have done well
 
 
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