@Anonymous User
Go to My Account/Passes & Vouchers, and look at what Passes are shown.
Might the Pass be in the very top section, waiting there to be activated?
Or would this Pass by any chance appear as a Sky Sports Mobile Pass?
If so, you can only watch it on your phone, not your tablet, and you can only watch five of the 11 Sky Sports channels:-
See here:-
https://help.nowtv.com/article/sky-sports-day-week-month-pass
Full: All 11 Sky Sports channels
Mobile: 5 Sky Sports channels - Premier League, Action, Arena, Racing & News
But If that’s not it, please come back and tell us what you do see under Sports Passes.
Please note that I am just a customer like you, and my advice may well be worth no more than exactly what you paid for it.