There weren’t any changes to how the Wi-Fi connection works in this release, maybe there is something else causing your issue.
The Wi-Fi adapter should be plugged in before the H9000 is booted, it won’t work correctly if it is removed are plugged in after it is booted.
Have you tried plugging the adapter into a different USB port on the H9000?
Can you try creating an Access Point and letting me know if you are able to connect to your computer? https://cdn.eventideaudio.com/manuals/h9000/2.0/content/setup/h9000setup.html#creating-a-local-access-point