Device limit reached for this Apple ID

New iPhone 15 Pro picked up yesterday. I removed my old iPhone 13 mini from my device list via my Mac through Settings -> Apple ID.

I get the above error when trying to download music on my new phone. The error message gives the following instructions:

"...go to Account > Account Settings > Manage Devices, and remove unused devices."

But when I open up the Music App on my Mac and try to following the instructions, I don't have "Manage Devices" as a setting on my Account Settings page. There are a number of sections like "Apple ID Summary", "Hidden Items", "Purchase History", etc, but none of these has a "Manage Devices" option.

I'm confused and at a dead end. My next steps? The goal is to be able to get music downloads to work on my iPhone so I can listen to music when I'm offline.

[I tried Googling, but couldn't find an answer]