Azure Function App works locally. When deployed, Azure cannot detect my function. No errors, no indication as to why.

Question

Azure Function App works locally. When deployed, Azure cannot detect my function. No errors, no indication as to why.

Tyler Suard 55

As the headline says, my app works perfectly locally. I am using the same runtime and environment variables in my Azure function app. The app will not detect my function. I understand this is usually because of an error, but there is no error in the deployment logs, no error in the streaming logs for the runtime, and there are no application logs.

Pravallika KV 1,230 Reputation points Microsoft External Staff Moderator

2025-10-31T03:21:05.2033333+00:00
Hi Tyler Suard,

Thanks for reaching out to Microsoft Q&A.

Please provide below details to investigate the issue further.

What is the runtime stack of the function app? Please provide code and the dependencies if possible.

Are there any particular differences in the environment or configuration settings between local and Azure deployments?

Have you added any specific dependencies in your project that might not be available in Azure?

Are there any specific triggers you are using that might not be configured correctly in Azure?

Have you checked the activity log or Kudu console for any startup errors?

Navigate to Application insights of your function app=>Run query *Exceptions=>*check if there are any errors or exceptions recorded which may be leading to deployment issues.
Pravallika KV 1,230 Reputation points Microsoft External Staff Moderator

2025-11-03T02:24:29.2133333+00:00

Hi Tyler Suard, following up to see if you got a chance to check above provided response and if it was helpful. If you need any further assistance, please let me know.
Tyler Suard 55 Reputation points

2025-11-04T17:43:24.0566667+00:00

@Pravallika KV
1.Python 3.11
2.Same environment
3.All dependencies should be available in Azure
4.No all triggers should be configured correctly
5. No startup errors in the Kudu console or activity log
6. Nothing in the exceptions either.

I was able to solve the problem through trial and error, but it would be nice if function apps had more transparent logs for when no functions can be detected. Thank you for your help.
Pravallika KV 1,230 Reputation points Microsoft External Staff Moderator

2025-11-05T01:37:21.2266667+00:00

Hi Tyler Suard, Thanks for the confirmation. Glad your issue is resolved.

Answer accepted by question author

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Your answer

Pravallika KV 1,230 Reputation points Microsoft External Staff Moderator

2025-10-31T03:21:05.2033333+00:00

Hi Tyler Suard,

Thanks for reaching out to Microsoft Q&A.

Please provide below details to investigate the issue further.

What is the runtime stack of the function app? Please provide code and the dependencies if possible.

Are there any particular differences in the environment or configuration settings between local and Azure deployments?

Have you added any specific dependencies in your project that might not be available in Azure?

Are there any specific triggers you are using that might not be configured correctly in Azure?

Have you checked the activity log or Kudu console for any startup errors?

Navigate to Application insights of your function app=>Run query *Exceptions=>*check if there are any errors or exceptions recorded which may be leading to deployment issues.
Pravallika KV 1,230 Reputation points Microsoft External Staff Moderator

2025-11-03T02:24:29.2133333+00:00

Hi Tyler Suard, following up to see if you got a chance to check above provided response and if it was helpful. If you need any further assistance, please let me know.
Tyler Suard 55 Reputation points

2025-11-04T17:43:24.0566667+00:00

@Pravallika KV
1.Python 3.11
2.Same environment
3.All dependencies should be available in Azure
4.No all triggers should be configured correctly
5. No startup errors in the Kudu console or activity log
6. Nothing in the exceptions either.

I was able to solve the problem through trial and error, but it would be nice if function apps had more transparent logs for when no functions can be detected. Thank you for your help.
Pravallika KV 1,230 Reputation points Microsoft External Staff Moderator

2025-11-05T01:37:21.2266667+00:00

Hi Tyler Suard, Thanks for the confirmation. Glad your issue is resolved.

Answer 1

Hi Tyler Suard,

Thanks for reaching out to Microsoft Q&A.

When this issue happens, most of the times it's a code structure or configuration issue preventing Azure from discovering the function during deployment.

Function not placed correctly or missing files:

Azure discovers functions by scanning subfolders under wwwroot for all the function related files.

If the files are missing or malformed, no functions are registered.

Check after deployment (via Kudu or VS Code’s “Remote Explorer”): /site/wwwroot/<your_function_name>/
If missing: The deployment didn't pack the function properly.

Check all the required App Settings are available in Azure function app.
Make sure deployed directory contains the main function files.
Make sure there are no particular differences in the environment or configuration settings between local and Azure deployments
If your function is Python V2, most of the times the deployment issue occurs because of missing required modules in requirements.txt or code structure.

Add all the modules required to run your function are added in requirements.txt file to get installed during deployment.

Check the activity log or Kudu console for any startup errors:

Navigate to Application insights of your function app=>Run query Exceptions=>check if there are any errors or exceptions recorded which may be leading to deployment issues.

Hope it helps!

Please do not forget to click "Accept the answer” and Yes, this can be beneficial to other community members.

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Azure Function App works locally. When deployed, Azure cannot detect my function. No errors, no indication as to why.

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