Eligible to claim full year's expenses for AOTC if only part time and only took one semester?

For the American Opportunity Tax Credit (AOTC), the IRS states "must be enrolled a minimum of half time for at least one semester." Does this mean that all tuition costs for the entire tax year are able to be claimed, up to the max limit, as long as part time status was obtained at least one semester that year, even if the student only took one semester that year? My 1098-T form says I am a half time student but I want to confirm. I took one semester in 2018 and one semester in 2019 both part time and both 1098-T's said I was a half time student. I just found out about this credit and when I called the person who prepped my taxes for me they told me I did not qualify for it because I was not a fulltime student and I was a graduate even though 2018 was only my first year ever going to college so wouldn't I have been considered an under grad? He told me the credit I was given was a Lifetime Learning Credit that year, I just feel he was wrong and I wanted some advice