Trying to register in the app (UK) but I don't know what is the Personal identity number is

Right after the Tax ID which, if I understand correctly, is the national insurance number in the UK, I’m being asked to enter Personal identity number. If I tap on “what is this” it says “Personal identity number is a unique sequence of digits/letters assigned by your country and used for identification purposes” that unfortunately doesn’t tell me much - the only thing that comes to my mind is passport number… tried googling and there is no mention about this. Thank you for your help!

Passport or driving licence.

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It may differ for each citizenship - I forgot to mention that my nationality is not UK so l had to look up what is the correct equivalent for my country here:

There are indeed some differences from country to country. Usually it is a unique number issued individually by the government that is used for taxation purposes.

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