Follow these instructions, and report back how far you get, and what your results are :-
On your phone, tablet or computer, sign in to Now, and then select My Account/Manage Account/Now Membership.
Can you see a Cinema Membership listed?
If you can, can you access the new Wonder Woman OK?
If so, go back to your Huawei, and make sure you are signing in with the exact same account details.
Can you now watch the movie?