VLOOKUP is definitely the function that you need. It's just a matter of applying it.
What exactly is it doing incorrectly? Are your range set correctly? Did you absolute (use the $ sign) the necessary ranges? (It should look like: =VLOOKUP(B2,SHEET2!$A$1:$A$100,2,FALSE). )
Other than that, I would again recommend posting a sample of your spreadsheet (use dummy data if your info is confidential).
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