Don't know about your problem importing from JPMorgan. But if you use the Online version you can not merge it into your existing Desktop return. You can download the .tax2022 file from online for free and then OPEN it in the Desktop program as another return and then have to enter everything else again.
Have you tried calling support to ask about JPMorgan?
How to contact Turbo Tax
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-contact-turbotax/00/26991
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
