Thanks for reaching out to the Roku Community!
I'd be happy to take a closer look to see how we can help you to add channels to your Roku device. Can you please provide more information about the issue you are experiencing? What was the error message when attempting to add the channel? Which streaming channels are you experiencing this issue on?
We would also recommend taking a look at our Support page for more information regarding How to add apps to your Roku streaming device | Roku
Please keep us posted and we'll continue assisting you from there.