Same here:
I was able to “deploy” using this reference but got this error: No credential was provided to access Azure Container Registry. Trying to look up…
Then, expectedly, this error when I navigate to the site:  Application Error
If you are the application administrator, you can access the diagnostic resources 9.
I just copied the config.prod.toml and credentials.prod.toml files to my folder (deleted the “prod” from the file names), updated the docker file to reflect my app name.
Could you please help?
Reference: Deploy a Streamlit Web App with Azure App Service | by Richard Peterson | Towards Data Science 14