Unable to view artifacts from Xcode Cloud build in Xcode - getting 501 error message

I'm trying to download artifacts from some recent Xcode Cloud builds. In both Xcode and App Store Connect I'm getting errors.

Xcode says: "Error Fetching Test Results: API Invalid status code: 501.

App Store Connect says: "artifacts could not be found."

FB13773789 - Xcode Cloud: Service returning 501 in Xcode when trying to view artifacts of successful build from minutes ago

I have tried several projects to rule out project specific issues and it is happening to all of my Xcode Cloud enabled projects. Both Xcode 15.3 and 15.4 beta exhibit this behavior.

Is anyone else running into this issue? I noticed it yesterday, and it continues into this morning.