Login to old iPhone issue

Ptkinn456 wrote:

Trying to login into old iphone with a passkey but don’t remember the code (prior to face ids)

There is no passkey you can use for a forgotten passcode. You'll have to erase the phone using a computer, by following the directions in this link --> Use a computer to reset your iPhone and your passcode - Apple Support

How to reset a forgotten passcode or password:

With a computer: Use a computer to reset your iPhone and your passcode - Apple Support

Without (requires iOS 15.2): If you forgot your iPhone, iPad, or Apple Vision Pro passcode, reset your device without a computer - Apple Support

This resets the passcode or password and erases device contents.

This does not bypass Activation Lock.