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I did and they said they can't do it over the phone... very incompetent. They said my browser was at fault. I tried Chrom... same problem. No answers chat... and I'm still not able to get this started. Terrible customer support.
Sorry that you're having difficulties with this. Please re-enter your payment details in your account, save them and try again.
Let me know how you get on.
I had the same problem. Try this. It worked for me.
1. At first I canceled the "one picture subscription" for Adobe Stock. (I don´t know how its called in englisch because I see everthing in german. But you will find subscription it in your Account next to your Creative Cloud subscribtion if you already bought a picture at Adobe Stock).
2. Second I retype the credit card number in the payment option for the creative cloud.
3. Then I tryed again to sign up for the mounthly AdobeStock-Subscription an it worked.
Hope it will works for you too.