Cannot log in to my sky app

[FELIXSTOWE+HUNTER]

I want to change my WiFi password. But to do this I have read that I need to do this via the my sky app. Unfortunately everytime I open the my sky app, I get a message saying postcode, which I enter, and then it asks for 2 digits of either my account number via direct debit payments or 2 digits from my bank card, both of which are to confirm the purchase of sky glass!? I haven't got sky glass so I am really confused. I haven't tried several digits, both my account number digits and even my bank card digits but to no prevail. 
please can anyone help? 
I have the white sky max hub and I think that ever since I got this I cannot log in to the my sky app and I'm so frustrated as getting hold of someone from sky to actually ask is beyond impossible. 
thanks in advance to anyone who can help. 

Ben

[Lisa-P1987]

Hi there, I’ve escalated your post to our Community Messaging team who will invite you to a private chat shortly and help you with this. 

Just look out for the colourful bubble to start the conversation. Please be aware conversations automatically close if there is no response within 48 hours.

Here's more information on how Community Messaging works - https://helpforum.sky.com/t5/Did-you-know/Escalating-a-post-to-a-Sky-expert/ba-p/3711147