Can’t get my husband signed up!

I’m keen on discovery bank. I like Discovery’s approach and have signed up and have the bank credit card. But I’m experiencing great difficulty getting my husband signed up as secondary card holder. I don’t understand the problem as he has been the secondary cardholder on my Discovery card for years. He is the primary income earner. I’m frustrated because I can’t reach my Vitality spending goals without his spending. so I can’t earn my rewards. I have phoned frequently. I believe the problem is now with the technical department. But they do not respond to my emails. What is going on at the new bank?