I have been struggling with our system because the engineers insist on us supporting 3 version of CC. this was causing all sorts of strange and apparently unfixable problems. So after many years of complaining about the unnecessary version of CC thay finally agreed to uninstall them.
Now, by doing that the dynalink stopped working. So, after a few days of research I was told that effectively there was a problem with the dynamic link in CC 2019.
But, since it was working before I figured, I use Audition everyday so, I'll just re-install Audition CC 2018 and we'll see.
Bingo, everything works again. Plus, when I send stuff from PP to Audition it opens CC 2019, Bonus!