Running non HTTP-triggered functions with Azure Functions on Azure Container Apps

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Azure Functions on Azure Container Apps (native)

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Question

How do you obtain a master key to use with the x-functions-key header to Manually run a non HTTP-triggered function when using the new Native Azure Function Support in Azure Container Apps.

I cannot create a _master key in the container app and reaching out to {app}.azurecontainerapps.io/admin/host/systemkeys/_master returns a 401.