I can`t receive whatsapp notifications on my Garmin forerunner 245 music even if it seems correctly configured. I saw the wahtsapp app for android has been recently updated...maybe something to do with it ?
do you use a 3rd-party watchface? I'm not really sure about it, but I've had the same issue. After reinstalling the Garmin Connect App on my Huawei Android Phone it works for a day. Then I changed the watchface and immediately the notifications stopped working. After changing back to one of the onboard-Watchfaces and reconnecting the watch with my phone two days ago it worked again and it works until now. I will monitor this the next days.