Title: File Handler custom actions not appearing — _api/v2.0/drive/apps returns empty

[AndreasDvrs]

Our File Handler custom actions are not appearing in the OneDrive for Business / SharePoint Online context menus. The _api/v2.0/drive/apps endpoint returns an empty "value": [] array, indicating the file handler has never been registered in SharePoint's cache (while we could locate and use the actions ~2 days ago.

What We've Verified:

• The application is online and all URLs return HTTP 200 (action URLs, icon URLs)

• The addIns section exists and is correctly structured in the Azure AD manifest

• The app is not hidden ("tags": [])

• The client secret is valid

• Admin consent has been granted for the tenant

• Tested in incognito/private browsing — not visible _api/v2.0/drive/apps returns {"@odata.context":"...","value":[]} — empty

• Re-consented — still empty after multiple hours

• Attempted $forceRefresh=1 cache reset — still empty

Some questions:

• Is there a known issue with file handler recently?

• Are there additional requirements beyond the addIns manifest and consent for file handlers to be picked up by SharePoint?

• Is there a way to force SharePoint to re-scan Azure AD app registrations for file handler manifests?

[manuelsidler]

Same here for our tenant and our customers. There are also some reports about the issue on Microsoft Q&A, but MS has not responded so far.

[ducdv-lumin]

Just my guess: I think Microsoft is fixing a bug related to a File Handler caching issue. They decided to reset all File Handler data and will restore them in the next few days.

[StefanoAnzolut]

@ducdv-lumin do you have any more insights here?

This is a breaking change for consumers. We are facing multiple customer reports about this behaviour.

Maybe @anarmawala or @ThomasMichon could provide any info? or ETA?

[ducdv-lumin]

@StefanoAnzolut Thanks for raising this. Just to clarify, my earlier comment was only a personal hypothesis (based on issues that our customers are facing) — I don’t have any confirmed insights from Microsoft at this point.
Given this is impacting customers, it would be great to get official confirmation or ETA from the Microsoft team. In the meantime, I’ll try to investigate further on my side and share any verified updates here.

[manuelsidler]

After a force refresh (https://nameofyourtenant.sharepoint.com/_api/v2.0/drive/apps?adminForceRefresh=1) and clearing the browser cache, our file handlers reappeared. I'd be interested in an official statement from Microsoft regarding the issue.

[raglib]

We got also our filehandler-s back now after refresh. Wonder if we will ever hear from Microsoft what happened and if this will occur again 😢

[attilabalazsy]

We got also our handler back! Ahh finally! Thanks for the update guys!

[attilabalazsy]

I have opened several tickets (M365, Azure) also asked our customers to do the same, but no official reaction till now.