Splunk O11y Integrations issues

[kumachop2]

Hi There, I'm trying to integrate with Spunk Observability Cloud to fetch Azure Native logs and need to get only Diagnostic logs
Initially I have completed POC in Sandbox subscription with no issues I used ARN template to deploy Function App.
Now I'm trying to setup in QA environment running to into issues. I have provided HEC endpoint and Splunk Token. I'm observing runtime error. Please do help me with doc how to setup this integration in private zone and let me know if needed additional details.

error:Functions runtime error
Microsoft.Azure.WebJobs.Script: Did not find functions with language [dotnet].

Much appreciated your timely response.