A "backdoor Roth" involves a Roth conversion, not a recharacterization. However, you told TurboTax that you did a recharacterization, which hopefully is not what you did, otherwise you actually did create an excess contribution to your Roth IRA because a recharacterization makes it as if the original contribution was to the Roth IRA, not to the traditional IRA.
A Roth conversion is reported separately on the tax return for the year in which the Roth conversion occurred.
