I've spent a while trying to sign up on a PC redeeming a code.
Using the apps.apple.com website doesn't work unless you're on Mac OS.
Trying to sign up through the Apple tv website returns "an error has occurred" with no other information. If I try to sign up using the code, it allows me to click a button to redeem it and then I get an endless loading wheel on the next page. I've tried it on Chrome and Firefox (normal and private browsing) with the same outcome.
I gave up and tried signing up through an ipad, but that just doesn't let me log in using my Apple ID account as it can't verify my identity.
If I try and sign in to my Apple ID account then I can get to the privacy policy page before the "continue" button doesn't work and I can't progress any further.
What am I missing? Why is it so difficult to just sign up to a streaming service? Every other one has been incredibly straightforward and it has just worked.