Forgot iPhone 8's password

That is the Passcode.

Keep trying until you see an Unavailable message appear on the screen.

If you see a iPhone, iPad, or Apple Vision Pro unavailable ...Apple SupportOfficial Apple Support › en-us

Once you have reset the phone, you can use your current backup to restore the data back to the phone.

It might be a good idea to write down the new Passcode and keep it in a safe place......even if you are sure that you will never forget it.

Password or Passcode?

Tell us what you see on the screen.