Specific local files song not playing on phone

[TrisanOdaSo]

Plan

Premium

Country

Germany

Device

Samsung Galaxy A5 / Computer

Operating System

Android 8.0.0 / Windows 10

My Question or Issue

I created a playlist of different songs from Spotify itself and Locals Files of my Computer, while most of them work perfectly fine, one specific song just can not be played on my phone, which still works on my Computer.

In case that is of importance: all of the local files song are in the .m4a format.