I am trying to file a joint return for 2023. When it asks for 2022 AGI I reported the figure from the 2022 transcript ($133,284). However, IRS rejected the figure and keeps asking for spouse's AGI (a non existent figure)
For a Joint return you enter the same AGI for each of you.
Try entering 0 for the AGI. The IRS might have processed your return later so the AGI didn't get entered in time. Especially if you mailed it. That works for most people. See,
https://ttlc.intuit.com/community/rejections/help/what-if-i-entered-the-correct-agi-and-i-m-still-getting-an-e-file-reject/00/27031
How to correct the AGI in the Online version
https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311
If you can’t get it to efile you will have to print and mail it.
https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/00/26258
Be sure to attach copies of your W2s and any 1099s that have withholding on them. You have to mail federal and state in separate envelopes because they go to different places. Get a tracking number from the post office when you mail them for proof of filing.