I got an Error Message on my first e filed return saying.

Error F8962-070 The e-File database indicates that a form 8962 or a binary attachment with description containing "ACA Explanation" must be present in the return.

The IRS rejected your return due to missing information regarding the Advance Premium Tax Credit.  You will need form 1095-A to provide information.

My client gets her insurance through her employer.   No idea why this error happened.