Family Plan - Apple Music

My wife had an individual Apple Music account and we recently changed it to the family plan. I went to Apple Music to start creating a playlist since I’m on the family plan. Anytime I try to add a song to the playlist or my library it sends me to a screen to subscribe to Apple Music. I’ve joined the link I got from my wife to join the family plan, I assumed that meant I’m subscribed, but that doesn’t seem to be the case. Are there any extra steps I need to do in order to add music to the library to create playlists, or to ensure I’m subscribed through our family plan?