If it is asking for my husbands AGI but then it says what is on line 11 of our 2023 1040, that is our combined AGI. Do I put both of our AGI combined or just his?

Where do I find my AGI?

https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

Your 2023 tax return shows your 2022 Adjusted Gross Income  (AGI)  If you filed a joint return then the AGI is the same for each of you.

Form 1040        line 11

If entering the amount from your 2023 tax return does not work, then try entering “0” instead.  If that does not work and you still cannot e-file, then print, sign, and mail your tax return.

You can get a free transcript of your past return from the IRS:  

https://www.irs.gov/individuals/get-transcript

Note: If you filed late or amended your return, your correct 2023 AGI may not be in the system. 

The AGI on the 2023 Form 1040 Line 11 is used for both of you when filing the 2024 tax return.