Forum Discussion
If I sign up for Britbox via Roku, I expect my Roku userid and password to work with Britbox. Just as every other streaming channel does. I have the same problem. I can watch it on my Roku devices. But its a no-go on any PC, laptop, or mobile device.
The consensus seems to be that Britbox isn't playing by the same rule that every other streaming service does when it comes to the use of Roku login credentials.
Generally, if you want to use a subscription across different devices and platforms, you need to sign up with the provider directly. (ie. Britbox).
I have used Britbox in a couple of ways. (I only watch on Roku devices, but just look for the best deal/subscription price).
I have subscribed directly with Britbox (and then used the standalone Britbox app) on my Roku. I have also subscribed to "Britbox through Amazon Prime". When I did that, I had to install Prime Video on my Roku in order to view it. (I could also install Prime on any other device, like a tablet or other non-Roku streaming device and then also watch Britbox there if I wanted to).
As a general rule though, any subscription purchased "on the Roku Channel" will need to be viewed on/limited to a Roku device (or if eligible, through the Roku mobile app).