I'm not sure what is going on. I'd suggest look carefully at all the questions TT asks about this and make sure they are answer correctly. Trying a zero amount as the taxable amount was a very smart idea so you could get a sanity check on the calculation. But there should be a way to get TT to decide that for itself.
Wait, what is the tax year for the 5498 you're talking about? The 5498 for TY 2020 isn't due to the IRS until 5/31/2021 and won't get to taxpayers until some time later.
BTW, technically the correct term for putting money back into a IRA is a "rollover" not a "roll back" ...
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