Sold iPhone still showing under my account

[Fred Zed]

I sold my iPhone 12pm a week or so ago. I signed out of my iCloud and factory reset the device. The new owner inserted their sim card and started setting up the device. All good.
Today whilst checking my Apple account via my MBP, I noticed that it still shows the iPhone 12pm listed there, even the phone number of the person that bought it from me. Is there any reason why this has happened? Cheers.

I came across this old apple support thread...

Old device shown in iCloud account - Apple Community

discussions.apple.com

 

[velocityg4]

Even if you remove iCloud from a device it might still show in your Apple Account. Remove them from their too.

Remove authorizations from iTunes Store.

View and remove your devices that are associated with your Apple Account for purchases - Apple Support

Manage the list of devices that can download and play items that you bought with your Apple Account.

support.apple.com

Remove from iCloud (also check the iCloud website for logged in browsers)

Check your Apple Account device list to find where you’re signed in - Apple Support

Learn which devices appear in your Apple Account device list, how to find your device's details (including if it's a trusted device), and how to remove a device.

support.apple.com

Remove from Find My (may be redundant)

Remove a device from Find Devices on iCloud.com

Use Find Devices on iCloud.com to temporarily remove a device from your list of devices or remove Activation Lock on a device you gave away or sold.

support.apple.com

If you haven't done so yet. Enable Two Factor Authentication.

Two-factor authentication for Apple Account - Apple Support

Two-factor authentication is designed to make sure that you're the only person who can access your account. Learn how it works and how to turn on two-factor authentication.

support.apple.com

 

[Fred Zed]

Even if you remove iCloud from a device it might still show in your Apple Account. Remove them from their too.

Remove authorizations from iTunes Store.

View and remove your devices that are associated with your Apple Account for purchases - Apple Support

Manage the list of devices that can download and play items that you bought with your Apple Account.

support.apple.com

Remove from iCloud (also check the iCloud website for logged in browsers)

Check your Apple Account device list to find where you’re signed in - Apple Support

Learn which devices appear in your Apple Account device list, how to find your device's details (including if it's a trusted device), and how to remove a device.

support.apple.com

Remove from Find My (may be redundant)

Remove a device from Find Devices on iCloud.com

Use Find Devices on iCloud.com to temporarily remove a device from your list of devices or remove Activation Lock on a device you gave away or sold.

support.apple.com

If you haven't done so yet. Enable Two Factor Authentication.

Two-factor authentication for Apple Account - Apple Support

Two-factor authentication is designed to make sure that you're the only person who can access your account. Learn how it works and how to turn on two-factor authentication.

support.apple.com

Cheers. So it appears that nothing is wrong or broken and this behavior is relatively normal. If so , it's all good then.
2FA has been active on my account and find my was disabled already as was the device removed from iCloud during transaction.