Here was the developer thread https://developer.apple.com/forums/thread/818403 I found with lots of other reports of "Unable to Verify App - An internet connection is required to verify the trust of the developer".

Although https://developer.apple.com/system-status/ was green for most of the 3-4 hour outage, the page now at least acknowledges two minutes of downtime:

    App Store Connect - Resolved Outage
    Today, 12:04 AM - 12:06 AM
    All users were affected
    Users experienced a problem with this service.

Not a great developer experience.