My iCloud account keeps asking me to enter a password for a MacBook I no longer have and don't have the password.

I recently picked up the iPhone 17, and setup the phone for iCloud backups. When I did, it prompted me for a password for an old MacBook Pro I had - I got rid of it a year ago. I went in to "Devices" on my iCloud to see if it was still there, and it wasn't. Yet my phone keeps asking for my password for that computer in order to sync. I constantly have a notification on my settings to do this.

How do I remove this? It isn't in my iCloud device, yet it still asks.