If you're still unable to subscribe to your QBO company at this point, I suggest you contact our Technical Support team for further assistance. They can pull up your account within a secure environment, and investigate this issue for you.
Open this article for the steps: QuickBooks Online Support. Please take note of their operating hours, so you know when they're available.
Let me know if you have other questions about QBO subscriptions by posting a reply below. I'll be sure to get back to you.
Open the link on your private/incognito browser and redo the process. Try using the billing address to register QB Online = billing address of your credit card.
Thank you for giving a follow-up in this thread, mooroovendilen-g.
Let me help and make sure you can process that payment for your subscription.
Your computer saves a lot of browser cache that helps load web pages faster the next time you visit. But overtime these data gets outdated and corrupted that can cause issues like the one you're experiencing.
I suggest you clear the browsers cache. This will help refresh the data and fix browsing issues.
These are the links for the steps on how to clear cache for your browser:
Please don't hesitate to post your concerns or click the reply button for questions about billing and subscriptions. I got your back. Have a wonderful week!