Empty pop up window when I try to add a song to my library
Whenever I try to add an Apple Music song to my iTunes library through the "+" button in iTunes I get an empty pop up window and an exclamation mark in the upper right corner of my iTunes where the notifications are - the notification says "Adding item to library - Cancelled". I've attached a screenshot of the popup I get. Restarting the laptop didn't change anything and I tried multiple different artists and albums - always the same popup. This used to work fine till a few days ago.
MacBook Pro 15”, macOS 10.14