Developing an AI Background Generator With NIM course (invoke URL not working)

AI & Data Science NVIDIA NIM Models
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Dear Nvidia Team,

While practicing the Developing an AI Background Generator With NIM course ,
However the invoke url link is not working anymore : - (https://ai.api.nvidia.com/v1/genai/stabilityai/stable-diffusion-3-medium)

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however it works from Nvidia site .

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could you suggest the alternative invoke url?