Yes. The requirement for the American Opportunity Tax Credit is to have been at least half-time.
There is also the Lifetime Learner's Credit and Tuition and Fees deduction where expenses count when even less than half-time.
Enter the 1098-T in the Education Section under Deductions & Credits and carefully answer the interview questions.
According to the IRS:
"The standard for what is half of the normal full-time workload is determined by each eligible educational institution."
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