It's not on your W2. You need your 2022 AGI to efile 2023. The AGI is on 2022 1040 line 11. If you filed a Joint return you use the same AGI for each spouse.
If you didn't file 2022 or filed it later in the year or mailed it, then try entering 0 for the AGI. If that doesn't work you will have to print and mail your return.
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