Really? They shouldn't have gotten that money. Whoops. I can find the relevant text if you'd like. No, I mean "problem" as in not getting money.
"For the first and second stimulus checks, Congress took a narrow view of which dependents were and weren't eligible for a payment, and some dependents you listed on your federal taxes may not have made the cut. The reason was a rule governing the first two checks that said no people over the age of 16 who are supported by their family would count toward the household total. That meant older teens, college students, older adults and older or adult children with disabilities that preclude independent living were all left out. However, the preliminary rules around the next stimulus check could change this situation in a big way."