In this blog I am going to show you how to fix an error you get during CPOS/MPOS activation. At times you may get following error :
Validation: Failed, Messages: <“Channel has not been published.”>
Go to Channel categories and product attributes. Select your store and in Category hierarchy select channel navigation hierarchy
Then click on publish channel updates
Now go back to your device and click on “Validate Devices for Activation.” You should not get the error message anymore. Hope this works!