IRS has sent refund but my bank has not received it. How can I track the refund? My bank is asking for a tracking number in order to research refund for me.

There is no tracking number for a federal refund.  Did you choose to pay your fees from your federal refund?  The problem may be with the third party bank that handles refund processing.

Your tax refund was not sent to TurboTax.   TurboTax does not handle your refund at all.

Santa Barbara Tax Products Group, LLC  (SBTPG) is the bank that handles the Refund Processing Service when you choose to have your TurboTax fees deducted from your refund. This option also has an additional charge from the bank that processes the transaction. 

You can contact them SBTPG, toll-free, at 1-877-908-7228 or go to their secure website www.sbtpg.com 

https://ttlc.intuit.com/questions/2580357-who-provides-the-refund-processing-service

https://ttlc.intuit.com/community/refunds/help/who-provides-pay-with-my-refund/00/26410

How can I see my TurboTax  fees?   

https://ttlc.intuit.com/questions/2565973-how-do-i-review-my-fees-in-turbotax-online