The following is a workaround that works for me on a Mac, not sure if it works on Windows.
1. Make sure you're logged out of the NOW TV website completely.
2. Go to http://www.nowtv.com/home/existing
3. Click on start watching for the pass you want to use. Sign in when prompted.
Now try watching and fingers crossed it will work.
I've reported the error to the team so hopefully it will be fixed soon.
Tks for reply; hadn't realised different browsers were counted as individual devices;
surely it should be looking at device id, not browsers.
Yeah yeah, before i joined NOW TV i had the device issue and had to get device changes through live chat. I didn't realise how bad the problem was on the Windows 10 App until yesterday and i've got it reported now for someone to look into it. @Geluk