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`az functionapp create` for .NET Core 3.1 on Linux fails

See original GitHub issue

az feedback auto-generates most of the information requested below, as of CLI version

az version:
“azure-cli”: “2.2.0”, “azure-cli-command-modules-nspkg”: “2.0.3”, “azure-cli-core”: “2.2.0”, “azure-cli-nspkg”: “3.0.4”, “azure-cli-telemetry”: “1.0.4”, “extensions”: { “interactive”: “0.4.3” }

Describe the bug Creating a function app for an existing app plan & storage account, using Linux consumption plan for a .NET Core 3.1 app fails with the error: The parameter LinuxFxVersion has an invalid value.

Confirmed the region is valid for consumption plan, and using a dedicated resource group with no other resources. I’ve tried various combinations of versions but can’t find a winning combination. Creating the function app with the same setup in the portal works correctly.

To Reproduce

create new RG
create new storage account
create function app plan

Run:

  az functionapp create \
    --resource-group $FUNCTION_RESOURCE_GROUP \
    --consumption-plan-location $AZURE_REGION \
    --name $FUNCTION_APP_NAME \
    --os-type Linux \
    --functions-version 3 \
    --runtime dotnet \
    --runtime-version 3 \
    --storage-account $STORAGE_ACCOUNT_NAME

Expected behavior New function app created.

Environment summary Bash on Cloud Shell.

Additional context Add any other context about the problem here.