Are you using the correct federal refund amount when you look on the IRS site?
Once your federal return has been accepted by the IRS, only the IRS has any control. TurboTax does not receive any updates from the IRS. Your ONLY source of information about your refund now is the IRS.
You need your filing status, your Social Security number and the exact amount (line 20a of your Form 1040) of your federal refund to track your Federal refund:
https://www.irs.gov/refunds
https://ttlc.intuit.com/questions/2584108-why-is-there-no-record-of-my-return-at-where-s-my-refund-wmr?jump_to=answer_4242575
Sometimes people get confused by the “summary” given by TurboTax and use the wrong amount for the federal refund. Make sure you are only using the federal refund amount, and not an amount that combined your federal and state refunds.