forgotten 6 digit code on my 15 pro max

Here you go. This will erase all data on the device. On the top of this Support Article there is a link you may be able to use to reset the passcode without using a computer.

If you forgot your iPhone passcode or your iPhone is disabled - Apple Support

Your ONLY option is to reset the phone (completely erasing it) …

… followed by restoring from a backup.

If you’ve forgotten your iPhone passcode or your iPhone is disabled – Apple Support (AU)