I live in the Caribbean and I thought science the island is technically part of holland I entered their postal code and it worked!!!
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Contact Apple Support team online and explain your problem, and they should be able to solve it:
The App Store is country specific.
If you are signing in to the store for your country it would not be requesting a postal code since it would know there are none for your country.
If you are signing in to the store for a different country, there is nothing you can do, as that different country does use postal codes, and would require it for a valid Billing Address for a payment method from that specific country.
You cannot use a billing method for a different country to the country for the store you are trying to sign into.
Question: where i live we dont use postal codes but i cant sign in to the app store without one what do i do???