My black nowtv box won’t let me sign in. It’s say oops we can’t sign you in right now. I can watch on my iPad but not my now tv box. I’ve performed factory reset and turned off and on but still say error message. I’ve moved the box and also so I don’t know. Any ideas.
Have you tried a quick soft reboot on your Router by switching the power off for say one minute ?
If the above doesn't make any difference, then can you go without the Internet for about 20 minutes, then maybe power down your router for 20 minutes.
Or perhaps factory reset your Router back to it's default shipped settings.
Bit of a long shot to be honest, where there is no guarantee it will work.
If you are using a Laptop or PC on the NowTV website, have you tried a different internet browser with it's ad blocking software disabled.
I don't use my PC for watching NowTV on their website or the dedicated NowTV App from the Microsoft Store so i won't be much help.
Perhaps get in touch with the NowTV live chat service for assistance & help.