Can someone help us locate the 24 character ID tracking number on our 1099 bank interest ?

You don't need to import that.  It should be just as easy and fast to manually enter it.  If there are several accounts listed on it you can just enter the total.  On the Let Us Enter Your 1099 page scroll down to the bottom and pick Enter a different way

Enter a 1099-Int under

Federal

Wages & Income

Interest and Dividends

Interest on 1099-INT - Click the Start or Update button

Why do you think you need a 24 character tracking ID?  Where is it asking you for that?   It asks you for a nine-digit federal ID number