Regression issue in SharePoint Online: Rest API "DefaultDocumentLibrary" and graph API "drive" are failing with "not found"

[mcgeeky]

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

SharePoint REST API

Developer environment

None

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

Error reproduced with SharePoint Online REST API and Graph API (_api/v2.0)

Describe the bug / error

Since yesterday I have customers reporting an error when trying to resolve the default document library in a site using the SharePoint Online rest API and graph API. This appears to be a breaking change that has been released in to SharePoint Online live and affecting more tenants as the change is rolled out.

This is the affected REST API:

https://DOMAIN.sharepoint.com/sites/SITE/_api/Web/DefaultDocumentLibrary

and the affected graph API:

https://DOMAIN.sharepoint.com/_api/v2.0/sites/DOMAIN.sharepoint.com:/sites/SITE:/drive

Where they were returning the default document library, suddenly, they fail with:

"A default document library could not be found in this site"

and

"The resource could not be found"

If this breaking change has not been deployed in to your SharePoint Online tenant yet then you won't see this behaviour reproduced. So far I have 3 different Office 365/SharePoint Online tenants reporting this error.

Steps to reproduce

Open Microsoft Edge browser.

Sign in to a site:

https://DOMAIN.sharepoint.com/sites/YOURSITE

then change the URL to:

https://DOMAIN.sharepoint.com/sites/YOURSITE/_api/Web/DefaultDocumentLibrary

and hit return.

Expected behavior

the API should return correctly with the default document library.

[Ashlesha-MSFT]

Hello @mcgeeky,
Thank you for bringing this issue to our attention. We will look into it and get back to you shortly.

[Ashlesha-MSFT]

@mcgeeky,
For my tenant API is working fine

To assist further, could you please share the tenant details? This will help us escalate and investigate the matter more effectively with our engineering team.

[mcgeeky]

Thanks for testing it. Yes, it is only affecting a few tenants. Can I send you the affected tenant details in a private message?

[Ashlesha-MSFT]

@mcgeeky,
Please share the tenant details at v-ashlpawar@microsoft.com

[mcgeeky]

Thank you! I have emailed the list of affected tenants to you.

[anderssonjohan]

@Ashlesha-MSFT same, but ~10 out of hundred of tenants. Full stop in businesses due to this error. Can't reproduce by setting up new sites in our dev tenant, so we expected something like this issue to pop up.

[jensgustafsson]

We are experiencing the same for >20+ tenants

[anderssonjohan]

@Ashlesha-MSFT I'm not sure if it helps, but service.cnf gives build version 12007 and 26016 for tenants where it still works. We're confirming with multiple tenants for https://[tenantname].sharepoint.com/_vti_pvt/service.cnf and all with errors seems to have 26023:

vti_encoding:SR|utf8-nl
vti_extenderversion:SR|16.0.0.26023

[mcgeeky]

and all with errors seems to have 26023

Two affected tenants had 26023, but one affected tenant is on 26016

[VesaJuvonen]

Issue has been flagged internally and apparently being worked on already. If anyone has a "premier support" option, those are great to speed up the resolution.

Huge thanks for flagging this also here so that others worldwide can see that there are issues and we can publicly share updates as the situation is progressing 🙏

[mcgeeky]

Thanks for the update @VesaJuvonen! Great to hear its been flagged and worked on :)

[jensgustafsson]

Any update on this? Is it realistic to believe that we have a solution in place for this before Monday? And what is the risk of this issue spreading to more tenants? We need to be proactive over the weekend and reduce the potential damage for our customers due to this.