The issue is an orphaned Azure DevOps organization whose deleted owner is still associated with Azure billing.
Ensure your account has the Azure DevOps Administrator role in Microsoft Entra ID.
Go to: https://dev.azure.com/zehan0786
Use Claim Ownership. Microsoft confirms an Entra Azure DevOps Administrator can reclaim an orphaned organization when the owner/PCA accounts are inactive. Role changes can take up to 1 hour to propagate.
After ownership is restored, go to Organization Settings → Billing and remove/change the Azure subscription billing association.
Then delete the VisualStudioOnline-... resource group