your situation raises the question as to whether or not you are covered by Tutbotax accuracy guarantee. It did not flag the excess. I tried a similar situation in desktop version and there was no flag that there was an excess so it's not that you made the error.
as stated, no guarantee, but you may want to file a claim
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-account-billing/submit-claim-turb...
