Request to enable Public API Endpoints, API returns 404 page not found

Dear NVIDIA Support Team,

All my API calls to endpoint https://integrate.api.nvidia.com/v1 always return 404 page not found error.
I have completed mobile phone verification on build.nvidia.com, the API key format is standard nvapi type without wrong characters.

Account information:
Registered Email: op@longwin.ltd
API Key prefix: nvapi-mP8x9
Account Type: Personal Individual Account
Purpose of usage: Personal development test, deploy LiteLLM proxy gateway for model fallback backup, non-commercial use.

Please help enable Public API Endpoints permission for my account, looking forward to your reply, thank you very much.