That sounds really frustrating, especially since you’ve already tried multiple cards and even confirmed them with your bank. From what you described, it seems like the payment method is being captured but not actually syncing to the billing side, which is why it keeps asking you to add one. The 404 on the email link makes me think there’s also a redirect issue.
I can help you sort this out. Quick question — do you see any payment method showing at all in your billing settings, or does it stay blank? @Geo8899PromptKing