Hello John !
The technican, I spoke with, was sent from HP to solve my problem. They know very well what is missing, but actually do not react.
Take a look at this post from me, which covers another known and simply ignored "Fax-Problem".
Internet-Explorer-11-disables Fx-Send Program from HP
HP is not interessted in the whole issue "FAX", as this is a dying technology, where they do not want to invest money any more. At least this is my opinion.
Regards
Peter