We find that it's simpler to sign up HBO Now outside the US with using an US iTunes account.
You may either use your existing iTunes account and change it to an US account or create a new iTunes account. The key here is to purchase a US iTunes gift card so that you can pay for the HBO NOW subscription.
- Purchase a US iTunes gift card. You can use this site or search on google or ebay.
- Open iTunes on your computer
- Once logged in click your name top right and select redeem
- Enter the gift card code
- Your account will change to a US account and you will need to enter US billing data. You can use http://www.fakenamegenerator.com/ to get a US address.
For troubleshooting should always restart device(s) and routers first. Then check your account status in your account home. You should always see IP ADDRESS STATUS and DNS STATUS in Green. Also make sure to have your subscription is active.