Neither am I, but I know that some acronyms are used recursively (like ATM Machine, PIN Number, NFC Communication, ...)
I'll keep this open, hopefully a third person may give an advice on this: it is a nice language "bug" btw 😄
I'd change it to either "PIN code" or just "PIN". Technically speaking, "code" is redundant too (personal identification number code), but it's commonly used (moreso than "PIN number" in my experience) and, to me, sounds better.
Personal Identification Number number is just wrong ;)
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