All SPFx web parts fail to load - Public CDN issues

[Tanddant]

Target SharePoint environment

SharePoint Online

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

💥 SharePoint Framework

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

• Edge Version 146.0.3856.62
• Firefox
• Chrome

Describe the bug / error

On a single tenant (so far) - we're seeing NO SPFx web parts loading at all, instead rendering a [object Object] error

I'm seeing CORS errors from the the public-cdn.sharepoint.com - client reports they've seen it for the past few days,

The network request looks like this

GET https://public-cdn.sharepointonline.com/<TENANT>.sharepoint.com/sites/apps/ClientSideAssets/59903278-dd5d-4e9e-bef6-562aae716b8b/modern-search-box-web-part_f7cae02a60fdd9184eb5.js

Stripping the CDN and trying

GET https://<TENANT>.sharepoint.com/sites/apps/ClientSideAssets/59903278-dd5d-4e9e-bef6-562aae716b8b/modern-search-box-web-part_f7cae02a60fdd9184eb5.js

Works just fine, initial thought was that it was related to MC1184996 but as we're seeing ...public-cdn.sharepointonline.... and not ...publiccdn.sharepointonline... I'm pretty sure it's unrelated.

Public CDN is (and was) enabled:

Steps to reproduce

No clue, be on an unfortunate tenant I guess, tenant is set to "Standard Release" and Data Location is "European Union\EFTA"

Expected behavior

Web parts should load 🤷

[VesaJuvonen]

Hi @Tanddant,
as it's only visible in one tenant, this is bit problematic. Customer should be able to open an normal support case for it as it's not really developer oriented issue. Would also double check the CPS settings on the tenant. If issue remains - ping me on 1:1 and share details on the tenant, so that we can get a bit more information to have a look on the situation.

[Tanddant]

Hi @Tanddant,
as it's only visible in one tenant, this is bit problematic. Customer should be able to open an normal support case for it as it's not really developer oriented issue. Would also double check the CPS settings on the tenant. If issue remains - ping me on 1:1 and share details on the tenant, so that we can get a bit more information to have a look on the situation.

Normal support ticket already in works, hopefully more details in the morning 👍

Raised ticket here in case others were facing same issue, or the issues spreads - CSP settings are as expected, but as it's also affecting PnP modern search web parts, which I haven't seen on other tenants I sorta ruled it out 😊

[VesaJuvonen]

thx @Tanddant for the update on the progress. Good to indeed flag if others have similar issues as this one. Thanks for adopting the model for being transparent on these 🙏

[Tanddant]

Update

If I run disable public CDN wiht Set-SPOTenantCdnEnabled -CdnType Public -Enable $false things start working, if I reenable it with Set-SPOTenantCdnEnabled -CdnType Public -Enable $true thing break

Both have instant effect - for now client is just running without public CDN.

It appears that there's a configuration in the https://public-cdn.sharepointonline.com that's causing CORS issues with this particular tenant - @VesaJuvonen has tenant details if needed for further triage.