[Bug] Encountered an error (ServiceUnavailable) from host runtime.

[ksmets]

Expected Behavior

I'm using Azure Functions to deploy a Python 3.11 function app on Linux environment in Europe West. The function app works flawlessly when running on consumption service plan Y1.

However, when I change this plan to dedicated B1 or premium P0v3, the deployment fails and shows the status error where normally the version of the runtime should be listed. If you click on more details it states the message "Encountered an error (ServiceUnavailable) from host runtime."

If you try make an HTTP request, you get 503 Service Unavailable response.

After switching the service plan back to Y1, the function app functions as before.

We also tried plans B2 and P1v3, to rule out memory issues, but the same issue arises. We really want to be able to activate the "always-on" configuration setting, to get rid of warm up times.
Any solution?

Actual Behavior

No response

Steps to Reproduce

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Relevant code being tried

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Relevant log output

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requirements.txt file

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Where are you facing this problem?

Production Environment (explain below)

Function app name

runeasi-testing-python-fnapp

Additional Information

No response