Hitting "Did not find any initialized language workers" on Azure App Service Plan

I have a couple of environments on Azure, two running Azure Function Apps on Windows Consumption Plan, one running Azure Function App on App Service Plan (Linux).

I’m deploying the same code to all environments, but only Consumption plan works as expected, on Linux App Service Plan seeing these errors below. App Service Plan is P1v2 if that matters.

I used this command for adding the app service to previously created App Service Plan:

az functionapp create --resource-group Production --plan MyAppServicePlan --runtime dotnet-isolated --functions-version 3 --name myfunction --storage-account myfunctionstorage

Excerpt from the log:

'exceptionMessage':'Did not find any initialized language workers','exceptionType':'System.InvalidOperationException'}",07/28/2021 18:13:41
2021-07-28T18:13:41.411319516Z: [INFO]  fail: Host.Results[0]
2021-07-28T18:13:41.411325716Z: [INFO]  Microsoft.Azure.WebJobs.Host.FunctionInvocationException: Exception while executing function: Functions.HealthCheck
2021-07-28T18:13:41.411329916Z: [INFO]   ---> System.InvalidOperationException: Did not find any initialized language workers
2021-07-28T18:13:41.411334316Z: [INFO]     at Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcFunctionInvocationDispatcherLoadBalancer.GetLanguageWorkerChannel(IEnumerable`1 rpcWorkerChannels, Int32 maxProcessCount) in /src/azure-functions-host/src/WebJobs.Script/Workers/Rpc/FunctionRegistration/RpcFunctionInvocationDispatcherLoadBalancer.cs:line 27
2021-07-28T18:13:41.411339416Z: [INFO]     at Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcFunctionInvocationDispatcher.InvokeAsync(ScriptInvocationContext invocationContext) in /src/azure-functions-host/src/WebJobs.Script/Workers/Rpc/FunctionRegistration/RpcFunctionInvocationDispatcher.cs:line 283
2021-07-28T18:13:41.411351316Z: [INFO]     at Microsoft.Azure.WebJobs.Script.Description.WorkerFunctionInvoker.InvokeCore(Object[] parameters, FunctionInvocationContext context) in /src/azure-functions-host/src/WebJobs.Script/Description/Workers/WorkerFunctionInvoker.cs:line 93
2021-07-28T18:13:41.411356516Z: [INFO]     at Microsoft.Azure.WebJobs.Script.Description.FunctionInvokerBase.Invoke(Object[] parameters) in /src/azure-functions-host/src/WebJobs.Script/Description/FunctionInvokerBase.cs:line 82
2021-07-28T18:13:41.411360616Z: [INFO]     at Microsoft.Azure.WebJobs.Script.Description.FunctionGenerator.Coerce[T](Task`1 src) in /src/azure-functions-host/src/WebJobs.Script/Description/FunctionGenerator.cs:line 225
2021-07-28T18:13:41.411364616Z: [INFO]     at Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.InvokeAsync(Object instance, Object[] arguments) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionInvoker.cs:line 52
2021-07-28T18:13:41.411369316Z: [INFO]     at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.InvokeWithTimeoutAsync(IFunctionInvoker invoker, ParameterHelper parameterHelper, CancellationTokenSource timeoutTokenSource, CancellationTokenSource functionCancellationTokenSource, Boolean throwOnTimeout, TimeSpan timerInterval, IFunctionInstance instance) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 555
2021-07-28T18:13:41.411374116Z: [INFO]     at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithWatchersAsync(IFunctionInstanceEx instance, ParameterHelper parameterHelper, ILogger logger, CancellationTokenSource functionCancellationTokenSource) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 501
2021-07-28T18:13:41.411382816Z: [INFO]     at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(IFunctionInstanceEx instance, FunctionStartedMessage message, FunctionInstanceLogEntry instanceLogEntry, ParameterHelper parameterHelper, ILogger logger, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 279
2021-07-28T18:13:41.411387716Z: [INFO]     --- End of inner exception stack trace ---
2021-07-28T18:13:41.411392716Z: [INFO]     at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(IFunctionInstanceEx instance, FunctionStartedMessage message, FunctionInstanceLogEntry instanceLogEntry, ParameterHelper parameterHelper, ILogger logger, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 326
2021-07-28T18:13:41.411397516Z: [INFO]     at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.TryExecuteAsync(IFunctionInstance functionInstance, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 94
2021-07-28T18:14:01.164936038Z: [INFO]  Hosting environment: Production
2021-07-28T18:14:01.166290638Z: [INFO]  Content root path: /app
2021-07-28T18:14:01.166856437Z: [INFO]  Now listening on: http://[::]:8081
2021-07-28T18:14:01.167329237Z: [INFO]  Application started. Press Ctrl+C to shut down.

Full log available here:

log.txt

Some of the settings in the configuration:

On other environments, with Windows Consumption plan, I have used these set of commands to create an app (per README):

az group create --name AzureFunctionsQuickstart-rg --location westeurope
az storage account create --name <STORAGE_NAME> --location westeurope --resource-group AzureFunctionsQuickstart-rg --sku Standard_LRS
az functionapp create --resource-group AzureFunctionsQuickstart-rg --consumption-plan-location westeurope --runtime dotnet-isolated --functions-version 3 --name <APP_NAME> --storage-account <STORAGE_NAME>

Some folks hitting the same issue here: link.