I have the same issue; same amounts in boxes 1 and 2a, and the box "taxable amount not determined" says yes. Another thread said to change box 2a on Turbotax to the correct amount manually: https://ttlc.intuit.com/community/retirement/discussion/how-to-amend-withdrawal-of-roth-ira-due-to-e...
Can I ask how you solved this for yourself?
