It seems that Turbotax added the $700 Recovery rebate credit to my return in error. The IRS says it shouldn't be there and none of the explanations seems to fit. Error?

If Turbotax checked my return and didn't find anything wrong, I don't have a dependent anymore and our gross income was within the limits mentioned in the IRS notification, what can this be other than a Turbotax error? Did I miss something?