Repetitive notifications about "Device Added to Your Account"

After upgrading my Macs to MacOS 26, iPhone to iOS 26, iPad to iPadOS 26, and watch to WatchOS 26, I kept getting notifications about "Device Added to Your Account". Those were legit apple devices that I own, which I logged on using my Apple ID.

This is apparently a bug introduced with the OS 26 upgrade. Please fix as soon as possible.