It depends on how long you have claimed the credit. If you have already claimed it in the previous 4 years, you cannot claim it for the 5th year even if you haven't graduated yet. This makes sense because there are professional students that attend school but may years to graduate thus it is unreasonable to expect these students to be rewarded the AOTC year after year.
Here is an IRS link I have found to support my answer.
[ Edited 01/06/22|08:39 PM PST]
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