I have a Samsung Smart TV with ROKU Channel preloaded. When I click on Roku Channel, after a long pause I receive a message "The Roku Channel is temporarily unavailable. Please try again in a few minutes".
I purchased this TV a few years ago and this is the first time that I have tried to connect with the Roku Channel. Is there something that I need to do in setup to access Roku Channel? I have another TV that has fire TV and have no issue opening fire TV and viewing programs.
There are 4 or 5 other Samsung Smart TV users who are having the same problem as you. In my case, the Roku channel app worked great for years but stopped working about a week ago. My other apps (Hulu, YouTube, Tizen, etc) work well and continue to work well. Based on Roku support Emails to me, Roku support has escalated the problem to Roku second-level support for a solution.
Do a search of Roku channel and Samsung Smart TV to find other details.
