Make sure to register a complain with sky - lets make it clear we are not happy with their poor offering - https://help.nowtv.com/article/make-a-complaint-tv-options
Sky have restricted (or crippled) the bonus streams so they only work on a small number of devices. I'm luckly enough that I borrowed a fire stick so I can watch 1 bonus stream at a time. If sky would stop crippling them, I'd watch 2 or 3 of them on ...
Would recommend everyone sends a complaint to https://help.nowtv.com/complaints so they see the amount of unhappy paying customers there are for a poor restrictive service they are 'providing'.
sky claim bonus streams are unsupported on a PC. I would recommend you lodge a complaint at https://help.nowtv.com/complaints.Slim hope they'll do something about it.