We set up a Google Apps Script-based Intranet in our organization, which benefits from Google Apps for Education. We\'ve been using for months:
Bad news. Evidently this is the intended behavior from here on out. https://issuetracker.google.com/issues/63521070#comment4
mc...@google.com #4 Jul 11, 2017 04:42PM
Status: Won't Fix (Intended Behavior) To combat abuse, we recently expanded display of the "created by another user" banner to include all cases where either (1) a web app is published under a Gmail account and accessed by a user other than the publisher or (2) a web app is published under a G Suite account and accessed by a user outside the publisher's G Suite domain/customer.
We understand that legitimate applications are also affected by this change, and we hope that broader display of the banner informs users while still allowing developers to deliver useful, usable applications.
I'm affected too. I guess I'll just live with it - only impacts one small web app for me. As a Nonpofits user I'll take what they can give. (A heads up would have been nice though.)
I realize others have more at stake than I do - I hope you can find a workaround.