Your Tencent Cloud account needs to go through identity verification before any CVM instances in the Chinese mainland can be purchased.
Identity verification: Tencent Cloud has two types of identity verification: personal identity verification and enterprise identity verification. For more information, refer to the identity verification guide.

Purchase Limits for Pay-as-You-Go CVM Instances

• Pay-as-you-go CVM instances do not support:
  • Agents paying on your behalf
  • 5-day no-questions-asked refund
  • Postpaid monthly billing plans
• The purchase limit of pay-as-you-go CVM instances for each user in each availability zone is between 30 and 60. Please see the CVM purchase page for the exact purchase limit.