You cannot initiate a new WhatsApp conversation from your Galaxy Watch. You can only reply to incoming notifications and once you reply to them the notifications disappear. There are some apps on Galaxy Watch app store that allows you to initiate a conversation and reply multiple times in a conversation if remember correctly its name is Whats History, there is another app called Chat hub for WhatsApp [and something else is there in its name as well that I don't remember]. But these apps are not fully baked and it is just bare minimum, on top of that you have to pay to use any of these apps. This is how it is right now with Galaxy Watch, I know it is annoying. I am facing the same problem, hope we get a fix soon.
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I have the same problem. I had Gear Fit 2 earlier and now I am using Galaxy Watch. I remember till around mid-2018 I used to receive WhatsApp call notifications with the ability to either pick up or reject it, on my Gear Fit 2 even though it doesn't have a mic or a speaker. But then it stopped and now I only receive a notification on my Galaxy Watch about missed WhatsApp call. This is terribly sad, we need a fix for this soon. I tried a lot of different combinations of settings, but nothing works. Hope Samsung and WhatsApp are working on fixing this problem.
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