The IRS will be sending you a letter, so wait for it. They do not notify TT, but perhaps they adjusted your Recovery Rebate Credit because (1) you did not qualify for it; or (2) your 2020 income differed from 2019; or (3) their records indicate you were already sent it as a stimulus payment. (Some of those stimuli were sent as debit cards. Could you have received one, but threw it out as junk mail?)
Recovery Rebate Credit Frequently Asked Questions | Internal Revenue Service (irs.gov)
