Requested 6 digit old passcode when I have 4

Whose Apple ID is this?

If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Learn how to remove a device from a previous owner's account.

If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their Apple ID.

Singlerose Said:

"Requested 6 digit old passcode when I have 4: I have a new IPHONE 11. In order to 'Update Apple ID Settings', I am putting in my new 6 digit code. All good. Then it asks for my old 6 digit pass passcode. I only have a 4 digit code. What to do?"

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Using 4 Digits:

If this is your iPhone, then place two 0s in front of the code. See if that makes all the difference.