Before you submit, make sure the policy is for yourself, a spouse, or legal tax dependent and the policy wasn’t paid via payroll deduction.
Some policies are eligible for reimbursement, but don't qualify as Minimum Essential Coverage (MEC). If you aren't covered by a policy that qualifies as MEC, you can still be reimbursed for other eligible policies or medical expenses, but will need to consider them to be taxable income at the end of the year.
Here’s a table outlining the eligibility of common policy types and whether they qualify as MEC:
For details on what makes certain policies ineligible, see: Why isn't my policy eligible?