Hi Jeff,
I didn't realise you could do that.
I have just set up a routine using the iOS App (on iOS 11.0.2) to turn on an Indigo Alexa-Hue Bridge device (a lamp) and it worked for me. I then add a further two devices and I can now turn on three at the same time.
So, just to clarify, you select a device in the Routines section that is a device managed by the Indigo Alexa-Hue Bridge and it then gives you the message?
When I go to Add an Action > SmartHome > My Lamp: I get a lamp device (e.g. fake hue bulb) and I can set the brightness or turn it off and then select Next and then the Alexa App summarises the action e.g. "Alexa will turn off: My Lamp, Brightness: 0%" and then I can click Add and it is added to the list of Actions.
What version of the plugin are you running?