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Buy nowI appreciate your prompt response and for performing the recommended troubleshooting steps, @10steps.
I can see the urgency of getting your issue about entering customers' credit card info in QuickBooks Online (QBO) resolved. That's why I'm here to guide you on the next actions you need to help take care of this matter.
When adding a customer's card information, Intuit will perform a quick validation on it. Since the Community is a public forum, and we'll need to collect some personal information to pull up your account, I encourage you to reach out to our Customer Care team. They have all the tools to investigate this matter and guide you with a fix. To do this, here's how:

Also, to further guide you in managing your customer information and sales and income transactions in QBO, I'd recommend checking out this article: QuickBooks Online Help Articles.
Keep me posted if you have other concerns about managing customer accounts and sales transactions in QBO. I'll gladly help. Take care, and I wish you continued success, @10steps.