Azure signup fails at payment step (individual, China) - need failure diagnosis

Hi,

I am trying to create a pay-as-you-go Azure account (offer=ms-azr-0003p) and the signup fails at the final payment information step. The page only shows a generic error: "We could not complete your signup. Please try again. If the problem persists, contact customer support."

Diagnostic info shown on the error page:

• sessionId: 32661bbc-9ff1-4b6a-ad73-caa5b2554072
• correlationId: 285439bb-1acc-4814-bdab-50d8d9f5262b
• timestamp: 2026-11-12T02:32:54.518Z

My signup context:

• Account type: individual
• Country/Region: China (Shanghai)
• Payment method: VISA USD credit card issued in mainland China (foreign transactions already enabled)
• Network: direct connection from mainland China, no proxy or VPN

Questions:

1. What is the specific failure reason behind this correlationId? Card authorization declined, billing address verification failure, or is individual Azure global signup restricted for mainland China addresses?
2. If a region or account-type restriction applies, which entry point should a mainland China company (with a business license) use to obtain an Azure account and Azure OpenAI access?
3. Is there a web-based channel that does not require a phone call to complete account opening?

Thank you.