Have you been a dependent on someone else's tax return? A dependent cannot get education credits but the person who claims them as a dependent can get the credit. If you were not a dependent you can only amend as far back as 2016 to seek the credit.
https://ttlc.intuit.com/questions/3262983-who-is-eligible-to-take-the-american-opportunity-tax-credi...
https://ttlc.intuit.com/questions/1900981-can-i-deduct-education-expenses-that-were-paid-with-studen...
https://ttlc.intuit.com/questions/1901172-what-are-education-tax-credits
https://www.irs.gov/help/ita/am-i-eligible-to-claim-an-education-credit
https://ttlc.intuit.com/questions/3383321-why-didn-t-i-get-a-credit-or-deduction-for-education-expen...
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