These instructions are applicable only after completing the process of programming the universal remote and adding Alexa to your soundbar. If your remote is already able to control your other devices and you are already using Alexa with your soundbar, follow these steps so you can change channels using the Alexa voice assistant.
Open the Bose Music app and tap the image of the soundbar shown in the bottom-right corner of the screen. If the image is a different product, tap the My Bose icon in the top-left corner, select the soundbar, then tap the image of the soundbar shown in the bottom-right corner.
Select Settings > Voice Assistant > Alexa > Devices > Cable/Satellite Box
Select HDMI Input then choose the TV input your cable or satellite box is connected to, then tap Save
Select Postal Code and Cable Provider, enter your postcode, choose your cable or satellite provider from the list, then tap Save
Tap the icon in the top-left corner five times to exit the Settings menu