The AGI is not found on your W-2. That would be found on your 2018 return. You can get that number by logging into your 2018 return and looking on lines 4 if you filed a 1040EZ; line 21 if you filed a 1040A; and line 37 if you filed a 1040.
You can also request a tax transcript to get that amount if you cannot get into your 2018 return. To do so, click here: https://www.irs.gov/individuals/get-transcript
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