Why has my Step counter stopped working on my Asus Zenwatch?

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AC Question

Step counter not working on Asus Zenwatch

Hi, I've just bought and set up the Zenwatch and installed the Wellness app on my phone but the step counter is not registering any steps at all on my watch. I have tried the UP by Jawbone and Fit app on the watch and they are the same. The software is now 5.0.1 . Can anyone advise why this may be the case....thanks in advance