If you see this error message, you may be entering your key number incorrectly.
You only need to enter the digits after your Key Prefix into the Key Number field.
For example, if your key reads: AB12345
AB = Key Prefix located in the drop-down menu
12345 = What you need to enter in the Key Number field
Be sure you are not entering the Date Code (see the green arrows below)
Many New York Locks now have the key number on the key itself. Key Prefix can be either BB or RB for the Standard or LS sized locks or PP or RP for the New York Fahgettaboudit Mini Lock.