In terminal enter alsamixer
Hit [F6] and select HD-Audio Generic, (assuming it is listed)
Then in alsamixer find all output channels showing [M] one by one and hit M key on each to unmute. Also increase level to maximum for each.
Post a screenshot of your alsamixer display. That may help us fault-find with you.
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What options do you see when you hit [F6]? Show a screenshot of that please.
EDIT: I wonder if your drivers are up-to-date.
In Software Updater, check source is set "Main Server" (not a local server), then check for additional drivers.
"Dummy Output" OK, we see occasional cases of that.
Websearch using AMD/ATI Device 1637 dummy output ubuntu 20.04" for your sound device gives:
Only suggestion I see is maybe try a later linux kernel. But using a later version kernel not tested by Zorin devs may or may work, but could give you other issues.
EDIT: Did you try this:
pulseaudio -k && sudo alsa force-reload
Also:
I see you have bought Pro. That gives you entitlement to support from Zorin devs. You could try an email to them, but please be patient for any reply as there are only two of them.
Yes that is exaclty my problem, i have the same computer, Huawei Matebook D16.
It's the first time i unstall a linux that i want to use everyday, this is why i bought pro, i tought i wouldn't have any problem... yes i will maybe try to contact the support. Don't feel like touching the kernel, i am a absolute noob.
DIdn't try your last suggestion, while playing with all my settings, i have desactivated the trackpad !..f... !.. and i don't have any mouse for now... so i cannot do anything anymore.