The F8962-064 reject code indicates that the IRS requires Form 8962, Premium Tax Credit, to be included with your tax return. This code typically arises when the e-file database shows that this form is missing or not properly attached to your submission. To resolve this issue, ensure that Form 8962 is completed accurately and included in your e-file submission. If you are using tax software, check that the form is correctly filled out and submitted with your return.