The 'ContactPhoneNum' element is invalid.
The full error is here:
The ‘ContactPhoneNum’ element is invalid – The value is invalid according to its datatype – The Pattern constraint failed.
Our Explanation: This error is commonly known as the ACA ContactPhoneNum validation error. It means the contact phone number in your ACA XML file does not match IRS requirements. The number must be between 10–15 digits so the IRS can reach the coverage provider if there are questions about the submission. The 1095 software will automatically remove hyphens and keep only digits. While the contact phone number field is optional, if included, it must meet IRS formatting rules.