https://www.cnbc.com/2019/01/31/apple-revokes-enterprise-license-key-from-google.html

Apple on Thursday appears to have revoked Google's enterprise developer certificates in retaliation for an app that violated its policies. The move could make it impossible for Google employees to test iPhone apps and use certain internal apps. The move was first reported by The Verge.

A Google spokesperson said, "We're working with Apple to fix a temporary disruption to some of our corporate iOS apps, which we expect will be resolved soon." Apple did not return a request for comment.