I checked the On Demand Tax Guidance but none of the following situations apply:
Top Ten Reasons Why a Child or Relative Wouldn't Qualify as a Dependent:
1. The person isn't a citizen or legal resident of the United States, nor a resident of Canada or Mexico
2. The person provided more than half of their own support for the year.
3. You told us another relative in your household will be claiming them this year.
4. The child's other parent is claiming them on their tax return this year.
5. The person lived with you for less than 7 months, and another with whom they lived more than 6 months qualifies to claim them.
6. The person lived with you less than 7 months, and you indicated you provided less than half their support.
7. You told us the person's income was over $4,300.
8. You said there was someone else who qualifies to claim this person as a dependent.
9. The person is married and filing a joint return with their spouse to claim more than just a refund of tax withheld.
10. You said they were not a full-time student, and that their income was over $4,300 or you did not provide more than half their support for the year.
