Correct, you can have one education credit or the other, but not both.
Go back to the Deductions & Credits section to revisit Expenses and Scholarships (Form 1098-T). The details for the student should only be entered once. Be sure to run through the section and select Wrap up tax breaks.
For more details, see:
Thanks! I think my confusion was that one screen in TurboTax says that we are _eligible_ for the AOC and the LLC. But on a later page it says we are getting a $2,000 credit for the AOC because that is the "best" option. I thought TT was crediting me for both of them.