After 12 attempts, my return was finally accepted.
Thank you EbonyA for your reply.
For others who had the same rejection issue, here's what I did.
When TT asked for my AGI, I entered it accordingly. When it asked for my spouse's (my wife's) AGI, I entered zero even though we filed married joint last year. Previously, I'd been entering the same AGI like mine, but it would always fail.
I hope this will help others.
