What do I do ?

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1

I’m trying to register for the Sat’s on College board but I can get past the first step. It’s keeps asking me for 4 unknown digits at the end of my zip code. What do I do ?

2

Those are ZIP code extensions and take the form 01234-5678; you can look yours up here:

https://tools.usps.com/go/ZipLookupAction!input.action