I had a similar problem. I did get notifications from Gmail and text messages but not from whatsapp and some others.
but when i swith on the setting "Show while phone is in use" (or something like that) all notifications work.
Hey! I encountered the same problem with my galaxy watch 42 mm. I bought in December and started using ir with my galaxy s7 and then with a galaxy s9+. From the beginning was able to receive message notifications from WhatsApp on the watch and reply (not starting conversations nor watching pictures/stickers/gifs like other comments mentioned). But, a few days ago the notifications stopped. I did not change any settings nor updated apps prior to this happening. I tried everything, reset the watch, restart the phone, updating every app and double checking the notifications for WhatsApp on the wearable app were turned on but nothing worked.... until, I turned on the "show while using phone" on the notifications settings in the wearable app. Voilà! Back to normal. Hope this helps.
I couldn't receive any message notifications from whatsapp on my galaxy watch even if i on and off it from the galaxy wearable app..
But i played with my phone (note 8) looking for solutions..i finally unlocked it..
Go to SETTINGS
Go to App Notification
Look for whatsapp and TURN IT ON..
Hope this could be of any help..
Hi..try the notification apps in your phone..
Go to settings (of you phone NOT THE SETTINGS OF THE WEARABLE APP ON YOUR PHONE) and see if the notification for whatsapp is on..
I had the same problem but when i tried everything and failed, i thought the the problem could be in my phone settings for whatsapp..and thats when i saw that the notif for whatsapp od off.
Then it worked..