Hi @Abhishek M ,
Thanks for using Microsoft Q&A!!
Azure Open AI studio chat playground doesn't use the AZURE_OPENAI_SYSTEM_MESSAGE
environment setting. Chat Playground use the System Template as you select it under the Assistant setup section as shown in the below screenshot -
The GitHub repository you are referring to contains the chat webapp source code that gets deployed using the above step and AZURE_OPENAI_SYSTEM_MESSAGE environment variable is used by the web application deployed by using the "Deploy To" button.
Please let me know if you have any questions.
Thanks
Saurabh
Please do not forget to "Accept the answer" wherever the information provided helps you to help others in the community.