Xcode Cloud failure - The Build - iOS action could not complete due to an error. Something went wrong and the Xcode Cloud team has been notified to investigate. The error may not occur on rebuild.

I also get the same message.

Looks like the issue is happening after the build finishes and the artifacts need to be uploaded:

I'm also facing the same. I can confirm, it is happening during saving artifcts.

I am experiencing the same issue today.

We've been seeing this issue all day today.

We're seeing the same issue today too, nothing on https://developer.apple.com/system-status/ or twitter?

Thank you for this report, we're currently investigating. I'll reply back and let you know if we found anything and when it is resolved.

We believe that we have resolved this issue and you should no longer be getting this error. 

If you continue to have trouble, please contact Apple Developer Support to provide more details including the following:

1. The steps you’re taking
2. The results of those steps
3. The exact text of any errors/messages
4. Any other relevant details

Thank you!