Custom file handlers in Sharepoint Online

Question

Custom file handlers in Sharepoint Online

Ragnar 15

We have developed and configured a custom filehandler in our tenant. Until last week the handler related icon and menu items were correctly visible in Sharepoint document libraries but now these are missing.

We have not made any changes to the app registration that defined filehandler actions and also the azure web app that is storing icon images and providing business logic is running.

Anyone else facing same issues?

Could it be related to Sharepoint add-in's development model being deprecated in Sharepoint Online?

Microsoft did not state that this would affect filehandler's but it is the closest change.

When I open below URL there are no entries anymore for our custom file type. Only PowerBI and AutoCAD configurations are shown

https://{tenant}.sharepoint.com/_api/v2.0/drive/apps?select=*,promoted&expand=actions

Manuel 40 Reputation points

2026-04-14T10:52:09.08+00:00

Same issue here https://learn.microsoft.com/en-ca/answers/questions/5859089/onedrive-file-handler-2-0-suddenly-disappeared
Ragnar 15 Reputation points

2026-04-14T10:55:50.97+00:00

Sorry did not see the post before. Yes we have exactly same error. At-least it is confirmed that I'm not going crazy :)
Attila Balazsy 65 Reputation points

2026-04-14T11:06:51.65+00:00

The issue started last week Thusday/Friday. This is the date when our first customer reported it. Then it is continuously propagated to other customers/tenants. It must be related to a change at M365/Azure.

We have contacted M365 support and Azure support. There is no positive reaction till now. I do not know, which MS department is in charge for this technology.

2 answers

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Manuel 40 Reputation points

2026-04-14T10:52:09.08+00:00

Same issue here https://learn.microsoft.com/en-ca/answers/questions/5859089/onedrive-file-handler-2-0-suddenly-disappeared
Ragnar 15 Reputation points

2026-04-14T10:55:50.97+00:00

Sorry did not see the post before. Yes we have exactly same error. At-least it is confirmed that I'm not going crazy :)
Attila Balazsy 65 Reputation points

2026-04-14T11:06:51.65+00:00

The issue started last week Thusday/Friday. This is the date when our first customer reported it. Then it is continuously propagated to other customers/tenants. It must be related to a change at M365/Azure.

We have contacted M365 support and Azure support. There is no positive reaction till now. I do not know, which MS department is in charge for this technology.

Answer 1

Jayden-P 20,495 Microsoft External Staff Moderator

Dear @Ragnar, @Manuel and @Attila Balazsy,

I found this article might help: Reload OneDrive File Handlers - OneDrive dev center | Microsoft Learn

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You can also consider using Tenant Admin Reset in case the issue persists:

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A user confirmed this force reset helped the file handler reappeared, please give it a try as well.

You can join the discussion here: Title: File Handler custom actions not appearing — _api/v2.0/drive/apps returns empty · Issue #1921

Jayden-P 20,495 Reputation points Microsoft External Staff Moderator

2026-04-20T09:45:43.3433333+00:00

Dear @Ragnar, @Manuel and @Attila Balazsy,

Are you able to get your file handlers back?

Any update would be great.
Ragnar 15 Reputation points

2026-04-20T10:10:35.57+00:00

Yes the filehandlers are working now again. Maybe we will find out in future what happened in background that caused the filehandlers to disappear.
Jayden-P 20,495 Reputation points Microsoft External Staff Moderator

2026-04-20T10:15:31.1666667+00:00

Hi @Ragnar

I'm glad to hear that, if my answer is helpful, you can consider upvoting the answer that provide helpful insights. It helps others with similar questions and supports a stronger, more informed community.
Attila Balazsy 65 Reputation points

2026-04-20T11:58:10.41+00:00

I can also confirm, the file handlers are back again.
Jayden-P 20,495 Reputation points Microsoft External Staff Moderator

2026-04-20T11:59:28.4333333+00:00

Hi @Attila Balazsy

Thanks for your confirmation. I appreciate it.

Answer 2

Jayden-P 20,495 Microsoft External Staff Moderator

Please note that this forum is not Microsoft Support; it is a community for users to help one another. As a forum moderator, I’m here to help guide discussions and share insights based on Microsoft documentation and community knowledge. I’ll do my best to support you with practical steps and point you to the appropriate resources.

Hi @Ragnar

First, I really apologize for this inconvenience has caused to your workflow.

After doing some research, I have noticed some users who are facing the same situation as yours.

Since this issue is affecting multiple tenants, my recommendation is to report this directly to Microsoft by creating a support ticket via Admin Center. Escalating this directly to the backend support team will allow them to collect the necessary logs from your tenant and investigate this behavior further.

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I will also moderate this situation. If I have any news or updates, I will inform you right away.

Thank you for your patience and understanding.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Attila Balazsy 65 Reputation points

2026-04-14T11:16:38.1+00:00

We already contacted M365 support yesterday, this is their answer:

After further review of your case with my internal team, it has been determined that the issue you are experiencing is related to a developer scenario and is therefore outside the scope of our support. Our team is not trained to handle issues of this nature. We recommend that you open a support request with the appropriate team that specializes in developer support for Microsoft identity platform applications. You can find more information and the options for creating and managing support requests here: Support and help options for Microsoft identity platform developers | Azure Docs
Ragnar 15 Reputation points

2026-04-14T11:19:42.9333333+00:00

Yes I got the same answer from cloud support. They asked to create a new request through https://support.serviceshub.microsoft.com/supportforbusiness/create?sapId=2afa6f15-b710-db46-909a-8346017c802f
Attila Balazsy 65 Reputation points

2026-04-14T11:23:09.68+00:00

Nice. I was checking this portal, but I was not seeing any suitable category there. Were you able to create a ticket there?
Jayden-P 20,495 Reputation points Microsoft External Staff Moderator

2026-04-14T11:28:54.0033333+00:00

Hi all,

You can try this link: https://serviceshub.microsoft.com/supportforbusiness/create

The previous link Ragnar posted is for Volume Licensing products.

Please note that Services Hub is paid support tickets.

Additionally, I have not found any official documents mentioned this unexpected behavior. I will keep a close eye on this situation, and if I see any new updates or workarounds.
Manuel 40 Reputation points

2026-04-14T16:38:38.46+00:00

@Jayden-P do you have any news? Our custom file handlers are still not visible in SharePoint and OneDrive.
Jayden-P 20,495 Reputation points Microsoft External Staff Moderator

2026-04-15T13:14:39.3+00:00

Hi @Manuel , @Ragnar, @Attila Balazsy

Unfortunately, I have not had any news about this behavior.

You can try reporting this issue directly via Admin Center > Health > Service Health > Report an issue.

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Custom file handlers in Sharepoint Online

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