New Spectrum Client box to replace the Cox minibus doe not allow audio

Spectrum required that I switch from the Cox minibox to the Spectrum Client Contour box.  After two lengthy phone discussions with techs to solve to "no audio" problem, the last tech said that I should replace the Spectrum box because it is likely faulty.  A tech person came to my house the next day but was unable to get the audio to work.  My tv audio was working fine with the old box and the audio quit after the new Spectrum box was installed.  I suspect firmware incompatibility between the Spectrum box and my Vizio tv.  The tech said a new tv would solve the problem or I could use Firestick or Roku products with the Spectrum app.  Has anyone had no audio after switching to the Spectrum Client box and if so, how did you solve the problem.  The tech tried hard but it did not solve the problem that the new Spectrum client box created.   (The tv audio worked fine before the switch to the Spectrum Client box).