Follow these steps ~
Go into the ST mobile app. Tap your way over to the market place and find the Hue Connect app.
Market Place --> Things --> Lights and Switches --> Light Bulbs --> Phillips --> Phillips hue light bulb.
Tap on that and it will take you through the process of linking your Hue Bridge to your ST hub.
In the Amazon Echo mobile app, you will link your Echo to your ST account. When you do that you go through the authorization process. You first choose the name of your location - probably home.
Next you click on a drop down menu, this will be the list of devices that are currently connected directly to your ST hub. In this list you will check every device that you want Echo to control.
Here is the important part ------
If there is a device connected to its own hub (not directly to the ST hub) you will NOT check the box for those devices. LEAVE THEM UNCHECKED. These will be any and all bulbs that are connected to your Hue hub. Also, things like Wemo devices - there is not a hub for these, but they are wifi and Echo will see them.
Now tap your way out to complete the process.
Ensure that your Phillips Hue Bridge and your Amazon Echo are on the same wifi network. When you discover devices on Echo it will find the devices that are connected on your Hue Bridge.
You can now control your Hue Bridge connected devices (bulbs) with the ST app, the Hue App, and Echo.
You can now control your ST connected devices via the ST app and Echo
If you have duplicate devices on your Echo, go back and follow the directions I just typed out. You did it wrong the first time.
Don’t think to hard about it. It works, it works good and no one knows or cares why. We’ve tried that idea already. Plus, you’re going to spend more time keeping your ST automations working than you will have to worry about trying to figure out another way to do what your read above.