List all Azure Functions with older runtime with Powershell

Dynamics 365 Business Central

Azure Functions supports two versions of the runtime host: 4.x and 1.x.
Function apps running on versions 2.x and 3.x of the Azure Functions runtime have reached the end of extended support.
The version of the Functions runtime used by published apps in Azure is dictated by the FUNCTIONS_EXTENSION_VERSION application setting.
The article discusses the challenge of identifying Azure Function apps running on an unsupported runtime.
The author attempted to use a Powershell script to filter out function apps with unsupported runtime versions but faced issues.
After discussions with Azure MVPs, a working Powershell script was created to list all function apps running on an unsupported runtime.
The script includes a custom column to display the FunctionRuntimeVersion for each function app.
The complete script can be found on the author's GitHub repository for reference.

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