Azure AD requires security keys to be protected with a PIN code. The PIN can be set during the enrolment process, or changed later if needed.
You can change or reset the PIN using either a Windows, MacOS or Linux system using the following procedures;
Changing the PIN on MacOS and Linux systems
For Mac and Linux systems it is possible to change the PIN using a tool that is built into the latest version of the Chrome browser.
This tool is available in the latest Chrome browser in macOS and Linux core system.
Users can find this tool in “Chrome Settings” => “Privacy and security” => “Manage security keys” . This tool provides the capability to manage PIN, fingerprint and credentials inside the security key and reset the device.