App Connect - Mystery Error - Unable to Submit For Review

"Unable to Submit for Review
The items below are required to start the review process:
An error has occurred. Try again later."

I'm seeing this mid-day on 8/13. Anyone else having issues? Everything looks green on the status page.
I guess we found a solution for this error in our case:

After re-uploading a new build around the date of first occurrence (Aug. 13th), the App ID configuration for push notifications lost the certificate at https://developer.apple.com/account/resources/identifiers/

We’ve just re-added the certificates and have been able to submit for review.
App Connect - Mystery Error - Unable to Submit For Review
 
 
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