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Hi Anurag,
The error "Our system has detected this request as unusual activity for your account" is typically generated by Azure's risk detection service rather than by the model deployment process itself. Since you've already confirmed your subscription is active, quota is available, and the issue is reproducible, there's unfortunately little you can troubleshoot from your side.
I'd recommend opening a Microsoft Support ticket and including the Trace ID, Client Request ID, and Service Request ID you've captured. These identifiers allow the engineering team to locate the backend logs and determine what triggered the risk assessment. They can also confirm whether the flag can be cleared or if additional verification is required for the subscription or tenant.
Before opening the ticket, it's also worth verifying:
The Azure AI Foundry resource is deployed in a region that supports gpt-5.6-sol.
The account has the required Azure RBAC permissions (for example, Cognitive Services OpenAI Contributor or equivalent).
No Conditional Access, tenant security policies, or organizational restrictions are blocking the deployment request.
If all of those check out, this is most likely a backend service issue that only Microsoft Support can investigate using the diagnostic IDs you've provided.
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