Check other function are working properly through chat and the positioning function, this will insure you are sync with the watch phone.
Check you have active data pack and proper network in watch phone.
Check the Watch phone is properly Bind with the phone.
Check whether the set period of time is normal (distinguish between morning and afternoon hours; for example, “2:00 p.m.” should be “14:00 p.m.” in the Class Mode interface).