Troubleshooting : PBS Help New

I entered my activation code at pbs.org/activate and got an "Activation Successful" screen but when I try to watch on TV, I'm told to activate again.
Why can't I see the PBS channel on my Roku device?
When I try to play a video on my Roku device, the PBS channel shuts down and I'm returned to the Roku home screen.
I am getting a "Video not available" message when playing a video
The PBS KIDS Channel on my Roku is saying I'm outside of the United States. How do I fix this?
Why am I seeing a "content disabled" message when I use an HDMI cord to watch videos on my TV?