We are following this repository: https://github.com/Azure-Samples/mcp-sdk-functions-hosting-python - and deployed the MCP server function successfully but wihtout the authentication parts necessary and we can not see the http_trigger function created ?

Question

We are following this repository: https://github.com/Azure-Samples/mcp-sdk-functions-hosting-python - and deployed the MCP server function successfully but wihtout the authentication parts necessary and we can not see the http_trigger function created ?

Turic, Mario 0

We are following this repository: https://github.com/Azure-Samples/mcp-sdk-functions-hosting-python - and deployed the MCP server function successfully but wihtout the authentication parts necessary and we can not see the http_trigger function created in the Azure portal or via Azure CLI ?

We have a private virtual network setup following the best practices of the official Hub-Spoke architecture on Azure.
We have integrated the created resources using the "azd up" command in the given repository into our private network.

We can see no errors during the deployment of the MCP server.py function code and afterwards also not checking the Activity Logging data. A screenshot is attached.

In the Deployment Center logging data we also see no errors or issues.

We can see all of the deployed files in the App files of the Azure function app.

Can you please support us in troubleshooting this issue or provide any documentation if you have on how to setup such MCP server inside of a private virtual network architecture and only expose/allow the connection to certain whitelisted IP addresses and/or domains ?

Thank you for your time and support,

Mario Turic

MCP_server_issue_singlePDF.pdf

Turic, Mario 0 Reputation points

2026-02-03T19:58:59.98+00:00

Hi @Siddhesh Desai yes I have done so multiple times and also tried to restart the Function app. Also I tried redeploying the source code to the app and still the custom function is not appearing.
Turic, Mario 0 Reputation points

2026-02-04T10:50:03.7166667+00:00

Can we please get any kind of support on this request ??
Turic, Mario 0 Reputation points

2026-02-05T08:57:04.9166667+00:00

Can we please get any kind of further support here besides asking to click the refresh button, someone from an Engineering team to read what we have send here ?
Siddhesh Desai 6,555 Reputation points Microsoft External Staff Moderator

2026-02-05T10:43:42.82+00:00

Hi @Turic, Mario

I am trying to reproduce your issue on my end; Can you please fill the form I have sent you on Private chat?
Turic, Mario 0 Reputation points

2026-02-05T10:45:46.83+00:00

Hi @Siddhesh Desai - I can not find any private chat here ? Can you please send any question or request to fill out here in this chat or to <Contact information removed for privacy>
Siddhesh Desai 6,555 Reputation points Microsoft External Staff Moderator

2026-02-12T16:57:01.8266667+00:00

Hi @Turic, Mario

We have created an incident internally with the product team, and I'll let you know once the product team responds with the solution.
Siddhesh Desai 6,555 Reputation points Microsoft External Staff Moderator

2026-02-16T18:04:24.83+00:00

Hi @Turic, Mario

This is the update I received from the product team:

Root Cause The customer deployed the mcp-sdk-functions-hosting-python sample on a PremiumV3 plan. The investigation found that the 3 conditions required for MCP Custom Handler to work were never simultaneously met:

Feb 3?10 (runtime=python): The configurationProfile=mcp-custom-handler profile was correctly loaded (via env var AzureFunctionsJobHost__configurationProfile), injecting customHandler.http.routes[0].route = "{*route}". However, FUNCTIONS_WORKER_RUNTIME was python, so the Python worker was used instead of the HttpWorker ? no functions were found because the MCP server code has no Python function bindings. Feb 11 onward (runtime=custom): The customer manually changed FUNCTIONS_WORKER_RUNTIME=custom, which correctly entered the HttpWorker path. However, at the same time, the AzureFunctionsJobHost__configurationProfile env var was removed. Since the customer's host.json does not contain a configurationProfile field, no profile was loaded, and the {*route} catch-all route was not injected. HttpWorkerFunctionProvider received routes=null and returned 0 functions ? "No job functions found". This is NOT a SKU issue. PremiumV3 works fine when all 3 conditions are simultaneously met: FUNCTIONS_WORKER_RUNTIME=custom + configurationProfile: "mcp-custom-handler" (via host.json field or env var) + customHandler section in host.json. The Flex Consumption auto-conversion (StandbyManager) is a convenience feature, not a functionality gate. HttpWorkerOptionsSetup has no SKU check ? it only checks FUNCTIONS_WORKER_RUNTIME == "custom".

Recommendations for Customer

Option 1 (Recommended): Fix settings on PremiumV3

Set both App Settings simultaneously, then restart:

FUNCTIONS_WORKER_RUNTIME = custom AzureFunctionsJobHost__configurationProfile = mcp-custom-handler No Feature Flag needed. HttpWorkerOptionsSetup does not check Feature Flags.

Option 2: Switch to MCP Extension approach

Use the Azure Functions MCP Extension with McpToolTrigger bindings:

Python sample: remote-mcp-functions-python Official docs: aka.ms/functions-mcp FUNCTIONS_WORKER_RUNTIME stays as python, no configurationProfile needed Lower risk of configuration mismatch

Option 3: Deploy on Flex Consumption as designed

Run azd up from the sample repo to provision FC1 automatically. The Bicep template includes VNet integration.

1 answer

Your answer

Turic, Mario 0 Reputation points

2026-02-03T19:58:59.98+00:00

Hi @Siddhesh Desai yes I have done so multiple times and also tried to restart the Function app. Also I tried redeploying the source code to the app and still the custom function is not appearing.
Turic, Mario 0 Reputation points

2026-02-04T10:50:03.7166667+00:00

Can we please get any kind of support on this request ??
Turic, Mario 0 Reputation points

2026-02-05T08:57:04.9166667+00:00

Can we please get any kind of further support here besides asking to click the refresh button, someone from an Engineering team to read what we have send here ?
Siddhesh Desai 6,555 Reputation points Microsoft External Staff Moderator

2026-02-05T10:43:42.82+00:00

Hi @Turic, Mario

I am trying to reproduce your issue on my end; Can you please fill the form I have sent you on Private chat?
Turic, Mario 0 Reputation points

2026-02-05T10:45:46.83+00:00

Hi @Siddhesh Desai - I can not find any private chat here ? Can you please send any question or request to fill out here in this chat or to <Contact information removed for privacy>
Siddhesh Desai 6,555 Reputation points Microsoft External Staff Moderator

2026-02-12T16:57:01.8266667+00:00

Hi @Turic, Mario

We have created an incident internally with the product team, and I'll let you know once the product team responds with the solution.

Answer 1

Hi @Turic Mario

Thank you for reaching out to Microsoft Q&A.

Posting this as an answer to help other community members.

As discussed on teams, Glad the issue is resolved.

The issue was resolved by you, and you also followed the steps mentioned by the backend team below:

Recommendations for Customer

Option 1 (Recommended): Fix settings on PremiumV3

Set both App Settings simultaneously, then restart:

FUNCTIONS_WORKER_RUNTIME = custom AzureFunctionsJobHost__configurationProfile = mcp-custom-handler No Feature Flag needed. HttpWorkerOptionsSetup does not check Feature Flags.

Option 2: Switch to MCP Extension approach

Use the Azure Functions MCP Extension with McpToolTrigger bindings:

Python sample: remote-mcp-functions-python Official docs: aka.ms/functions-mcp FUNCTIONS_WORKER_RUNTIME stays as python, no configurationProfile needed Lower risk of configuration mismatch

Option 3: Deploy on Flex Consumption as designed

Run azd up from the sample repo to provision FC1 automatically. The Bicep template includes VNet integration.

If the resolution was helpful, kindly take a moment to click on and click on Yes for was this answer helpful. And, if you have any further query do let us know.

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We are following this repository: https://github.com/Azure-Samples/mcp-sdk-functions-hosting-python - and deployed the MCP server function successfully but wihtout the authentication parts necessary and we can not see the http_trigger function created ?

1 answer

Your answer