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The possible reason is that the monthly subscription payment was not processed. You'll want to update your billing information to reactivate your account. Let me help you.
However, if the issue persists after trying to update the billing information, I suggest contacting our Support Team to help you reactivate your account.
Also, you can use either AMEX or VISA to register for your subscription.
You can check this article for more information: If your QuickBooks Online account gets suspended.
Let me know if you have any questions, I’ll be more than happy to help. Have a great day.