You will need to call the phone number listed on the correspondence received from the IRS. They are the only ones that can verify the documents were received. They don't tell you when they received fax documents so don't panic because they didn't confirm receipt; they don't do that. Having to fax in 1095-As and/or 8962 is a very common thing, so if your fax went through without error, the IRS has the documents and is processing them. Calling them is always an option, however.
