Siri won’t play my own playlists

The first thing to know is that I buy my songs, I do not use streaming services, so I do not have an Apple Music plan. I use to be able to ask Siri to shuffle any of my playlists that I have created but now it usually goes like this: “Hey Siri, shuffle my oldies playlist.” And now Siri responds with “Now shuffling oldies... Sorry, there was a problem with Apple Music.” And then immediately after when I open the music app to manually shuffle the playlist, there’s a screen that comes up saying “Get 1 month of free music.” This only happens with the playlists that I have created. If I ask Siri to shuffle Taylor Swift songs for example, or ask Siri to shuffle Hard Rock music, it works. For whatever reason my playlists seem to be the problem. Any help would be appreciated. Thanks!