Before MyCloudFitness app can sync to Apple Health App, please enable Sync data with Health App

Enable Sync Data with Health App 

A. Click on the Menu icon

B. Click on App Settings

C. Enable Sync Data with Health App

  

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Remove Apple Health App Connection

A. Open the Health app and tap the Summary tab.

B. Tap your profile picture in the upper-right corner. 

C. Under Privacy, tap Apps. 

D. Tap on MyCloudFitness app and turn off the health categories that you don't want to track.

https://support.apple.com/en-us/HT203037