Here's a script for anyone that has issues with Spotify's icon being on the wrong taskbar.
Requires Autohotkey (https://www.autohotkey.com/download/)
Only tested to work with Windows 10
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Download my script
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Move the AHK script into "C:\Users\%username%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup"
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Next time you boot your pc the script will run and fix spotify