Looks like you're not eligible for the AOTC. To qualify to must meet all of the below requirements.
- Be pursuing a degree or other recognized education credential
- Be enrolled at least half time for at least one academic period* beginning in the tax year
- Not have finished the first four years of higher education at the beginning of the tax year
- Not have claimed the AOTC or the former Hope credit for more than four tax years
- Not have a felony drug conviction at the end of the tax year
Note the highlighted item says nothing about having claimed it as an undergraduate. It merely states that you must not have finished the first 4 years of college.
