This is something you will have to work out with the IRS. You can call the IRS: 1-800-829-1040 hours 7 AM - 7 PM local time Monday-Friday.
Also, if you can not verify him using last year's AGI, you may have to mail your tax return. If you can't find your AGI to e-file, you can print and mail your return.
You can follow this to mail your tax return: How do I file my return by mail?
You stated that your 2023 refund amount was not as expected, but you did receive one? So the return was processed for 2023.
You can use this IRS tool Where's My Refund? to check on the status of your refund. It provides updates regarding the processing of your tax return.
If your refund is missing, you can Use IRS Form 3911. This form notifies the IRS about the missing refund and initiates a 'trace' on your refund.
Check the "Where's My Refund" tool before filing Form 3911 because Form 3911 is only helpful if the IRS has processed your tax return and the refund has been issued.
If the "Where's My Refund?" tool confirms that your refund has been sent to you but you have not received it, you should consider filing Form 3911.
This article provides some more details about filing Form 3911. Click here for "Missing your Tax Refund Payment? File Form 3911"
Click here for Form 3911.
Click here for additional information about Form 3911.
Click here for How do I find last year's AGI?
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