I have had the exact same problem since my Roku updated last week. I thought after a few resets etc etc it would eventually work. But by the looks of this it’s not going to. I pay for entertainment and movies and getting nothing at the moment so will have to cancel.
I have exactly the same problem. I get a message to say "Now TV is not available at present please try later." There is a Retry button but this does no good. I have tried resetting my Roku stick, my router and I have even taken out a Now TV adapter that worked for one day then failed as the Roku stick. Okay so I have now cancelled my subscription to Now TV but the annoying thing is that Now TV know full well I have paid for service because I can still watch Now TV on my iPhone until 11 April. What also annoys me intensely is that having now reported that "Now TV fails to launch" at least 6 times, all I get from Now TV is "We are sorry to see you go. What service are you going to use now?"
Also the email they send acknowledging the cancellation has no way of replying to NOW TV so they do not know why I am leaving. Nor do they really care, I am sure. I may rejoin after 11 April but only after a free trial and to see if I can get NOW TV on a TV.
I have also lost a week of NOW TV due to the app icon turning from a sporty orange to a very sickly green. No doubt this has something to do with the fact that the NOW TV stick I have does not work either even though I went all through the re-registration and getting my access to my account. I can see my payments but I CANNOT EMAIL NOW TV. GRRRRRRR!!!!!!!!!!!!!!!!!!!!!!!!
If you are using the older purple coloured Roku Stick model 3500, then at the moment there is no solution yet.
Where owners are awaiting an answer and hopefully a fix from NOW.
Are you using the older Roku purple Stick or another Roku model ?