In the associated devices with my Apple ID, I found a very old device: a Ipad.
I cannot remove it from the Appleid portal.
It is not anymore in my hands and there is a french line associated to it.
Why I cannot remove the device from the authorized devices?
iPad 2, iOS 9
"Authorize" means something specific. Note the distinction between computer authorization and device association - https://discussions.apple.com/thread/7106883
Read this support article for how to check your Apple ID device list to see where you‘re signed in, and how to remove a device from that list --> https://support.apple.com/HT205064
If by no longer having the device you mean it has a new owner, follow the instructions in this support article --> https://support.apple.com/en-us/109511#:~:text=If%20you%20no%20longer%20have%20your%20iPhone%20or%20iPad
"Authorize" means something specific. Note the distinction between computer authorization and device association - https://discussions.apple.com/thread/7106883
Read this support article for how to check your Apple ID device list to see where you‘re signed in, and how to remove a device from that list --> https://support.apple.com/HT205064
If by no longer having the device you mean it has a new owner, follow the instructions in this support article --> https://support.apple.com/en-us/109511#:~:text=If%20you%20no%20longer%20have%20your%20iPhone%20or%20iPad
Unable to remove old iPad from Apple ID associated devices
