Calendar not syncing

[Ethoirs]

Hello. I got my watch at Christmas and have been trying to get my Google calendar to sync with the watch nothing is happening yet.

I have a OnePlus 8T phone and the Samsung Watch 4. Can anyone please help me ?

[AndrewL]

@Ethoirs: I'm not 100% certain that this is possible without having the Samsung Calendar on your smartphone. The user manual simply states the following. 

You can check the 7-day schedules of events that you saved in your smartphone on your Watch. Tap (Calendar) on the Apps screen to check the schedules of events that you saved in your smartphone. To add your schedule, tap 'Show on phone' and add it on the connected smartphone.

[Richmar83]

I use Google Calendar on my handset and PC and calendar entries sync over fine.
First instance then I'd check that your handset has Sync enabled within Google Account settings for Google Calendar and Calendar. Also, have a look at any power saving settings you might have on the handset as I know on a previous handset then my power saving was preventing Google sync processes.