I believe this is a genuine technical error on TurboTax. I was able to get my AOTC when I revised my form in the "Federal Review" stage and was able to enter my EIN after the 3rd time I "reviewed" the form. Then I was prompted to "Relaunch my Deduction Calculator" (or something of that nature) and then my AOTC appeared affective.
I made a Discussion Post myself and posted the above here. I thought I'd reply here so the answer is more findable.
