Please follow the steps from this blog post too:
https://www.forbes.com/sites/bensin/2017/07/28/how-to-fix-push-notifications-on-oppo-phones/#601399891735
And check this settings as described here:
1.)
System Settings -> Battery -> Menu -> Aggressive Doze & App Hibernation
--> Turn these off completely or at least select "COL Reminder"
2.) System Settings -> Battery -> Menu -> High Power Usage apps
If COL Reminder is shown here, disabled them.
3.)
System Settings -> Advanced -> Recent App Management -> Normal Clear should be set, not Deep Clear
4.)
Apps -> Settings -> Apps Auto Launch
--> Turn this on in the top right corner and turn it on for COL Reminder
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