When you print your return for your records, the account number is X'd out for privacy. If there was no number at all, it would be blank. You should see the real number if you "print a copy to file by mail" but that function may not be available.
Also, if you used refund transfer to pay your Turbotax fees deducted from your refund, the bank account number on your tax return would be the number of your temporary account at SBT bank, they are the ones who deduct the payment and send the rest to your regular account.
Start with the usual route of using the IRS where's my refund tool. If a refund was paid and not in your bank account, you can trace your refund from the IRS. If you used refund transfer, call SBT directly. Note that if you entered the wrong bank numbers on your return, what is supposed to happen is that the bank will refuse the deposit, and the IRS will mail a check. But if the bank accepts the deposit (into the wrong account or even the wrong bank) then you have to work it out with the bank. If the IRS deposited the money where you told them, they wash their hands of it after.
https://www.irs.gov/faqs/irs-procedures/refund-inquiries/refund-inquiries-0
https://taxpayer.sbtpg.com/
