Configure WebAuthn with Device Biometrics for MFA

In the official documentation it stated that “Users can only enroll one device per type using WebAuthn with Device Biometrics (one phone, one tablet, one laptop/desktop). If a user wants to enroll another device of the same type, the first device must be unenrolled.” But why am I able to enroll my Android phone and Iphone under the same user account.

Please enlighten me how auth0’s device recognition works and how it behaves depending on the device OS.