Request to enable account (404 on chat completions)

Dear NVIDIA support team,

I’m using the NVIDIA NIM API (build.nvidia.com) and would appreciate your assistance. My API key authenticates fine — I can list models without issue — but I’m unable to run any inference. All chat/completions calls return a 404 with the message “function not found for account.”

I specifically need access to deepseek-ai/deepseek-v4-flash-0731. If my account needs to be enabled or the model requires activation, could you let me know how to proceed?

Thank you in advance for your time and support.