Function App Not triggering Blob Trigger & not listing function name

Question

Function App Not triggering Blob Trigger & not listing function name

INFO 20

Hi Team,

Due to subscription issue initially it was not creating function, but now it is creating after fix from azure team, but it is not fully fixed, now i am able to create function but i am not able to do blob trigger, even simple function i am not able to create or trigger.

Loknathsatyasaivarma Mahali 2,300 Reputation points Microsoft External Staff Moderator

2025-05-27T11:11:52.7633333+00:00

Hello INFO,

To investigate and understand the issue better could you please check the private message and provide us with the required details.

Here is the reference link on How to access & Data Privacy policy of private messages in Microsoft Q&A.
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-05-30T05:40:38.04+00:00

Hi INFO

Is your function working locally? Are you able to sync the trigger?
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-05-30T09:49:35.7466667+00:00
INFO, I have tested your code from my end and was unable to sync the trigger locally.

Hence, I have updated your code as below and it worked:

app = func.FunctionApp() @app.blob_trigger(arg_name="myblob", path="sourcecontainer/inputs/{name}.mp4", connection="AzureWebJobsStorage") def BlobTriggerVideoUpload(myblob: func.InputStream):

Able to deploy the function and sync the trigger after applying the above changes:

Portal:
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-05-30T14:15:47.8233333+00:00

@INFO, just checking in to see if you have had the opportunity to review my previous response and provide us with an update, so we can proceed accordingly.
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-06-02T04:01:56.1866667+00:00

INFO,

Following up to see if the provided information helped. If you have any further queries, do let us know.

1 answer

Your answer

Loknathsatyasaivarma Mahali 2,300 Reputation points Microsoft External Staff Moderator

2025-05-27T11:11:52.7633333+00:00

Hello INFO,

To investigate and understand the issue better could you please check the private message and provide us with the required details.

Here is the reference link on How to access & Data Privacy policy of private messages in Microsoft Q&A.
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-05-30T05:40:38.04+00:00

Hi INFO

Is your function working locally? Are you able to sync the trigger?
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-05-30T09:49:35.7466667+00:00

INFO, I have tested your code from my end and was unable to sync the trigger locally.

Hence, I have updated your code as below and it worked:

app = func.FunctionApp() @app.blob_trigger(arg_name="myblob", path="sourcecontainer/inputs/{name}.mp4", connection="AzureWebJobsStorage") def BlobTriggerVideoUpload(myblob: func.InputStream):

Able to deploy the function and sync the trigger after applying the above changes:

Portal:
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-05-30T14:15:47.8233333+00:00

@INFO, just checking in to see if you have had the opportunity to review my previous response and provide us with an update, so we can proceed accordingly.
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-06-02T04:01:56.1866667+00:00

INFO,

Following up to see if the provided information helped. If you have any further queries, do let us know.

Answer 1

Hi INFO,

I have tested your code from my end and was unable to sync the trigger locally.

Error Observed:


No job functions found. Try making your job classes and methods public. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).

[2025-06-02T10:03:43.191Z] Host lock lease acquired by instance ID '0000000000000000000000004F4DDDC0'.

[2025-06-02T10:06:20.921Z] Worker failed to index functions

[2025-06-02T10:06:20.923Z] Result: Failure

Exception: FunctionLoadError: cannot load the BlobTriggerVideoUpload function: the following parameters are declared in Python but not in function.json: {'name'}

Solution:

Hence, I have updated your code as below and it worked:


app = func.FunctionApp()

@app.blob_trigger(arg_name="myblob", path="sourcecontainer/inputs/{name}",

                               connection="AzureWebJobsStorage") 

def BlobTriggerVideoUpload(myblob: func.InputStream):

The name filed accessed through myblob.name contains the path to the container and the name of the file.

To use blob name for further operations, you can split myblob.name and extract the name of the blob and also container name as below:

Example code:

    blob_name = myblob.name.split("/")[-1]
    container_name = myblob.name.split("/")[0] 


    logging.info(f"Blob name {blob_name}")

Output:

[2025-06-02T12:02:08.601Z] Python blob trigger function processed blobName: pic-ed-source/inputs/sample.mp4Blob Size: 10 bytes
[2025-06-02T12:02:08.681Z] Printing the copied blob name sample.mp4
[2025-06-02T12:02:08.706Z] Executed 'Functions.lsayanablob_trigger' (Succeeded, Id=170f0f75-a42f-4d6e-8372-c5cfb4e31920, Duration=406ms)

Able to deploy the function and sync the trigger after applying the above changes:

Portal:

Hope this helps!

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If you have any other questions or are still experiencing issues, feel free to ask in the "comments" section, and I'd be happy to help.

Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-06-05T03:53:38.34+00:00

INFO, Just checking in to see if the provided answer helped. If it did, please click "Accept the answer” and Yes for the answer . So it can benefit other community members reading this thread. If you have any further queries, do let us know.
Pravallika Kothaveeranna Gari 955 Reputation points Microsoft External Staff Moderator

2025-06-06T03:24:28.72+00:00

INFO,

We still have not heard back from you. Could you please let us know if the answer provided below was helpful? If it resolves your query, kindly click Accept Answer and Yes, as it could assist other community members reading this thread. Additionally, if you have any further questions, please let us know.

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Function App Not triggering Blob Trigger & not listing function name

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