firebase-ios-sdk: Remote Config Permission Denied Error

Environment

• Xcode version: 10.2.1
• Firebase SDK version: 6.4.0
• Firebase Component: Remote Config & Auth
• Component version: 4.2.0 / 6.2.0

Describe the problem

Remote Config fetch results in an error:

Error Domain=com.google.remoteconfig.ErrorDomain Code=8003 "RCN Fetch Failure: Server returned error:code: 403. Status: PERMISSION_DENIED. Message: Requests to this API firebaseremoteconfig.googleapis.com method google.firebase.remoteconfig.v1.RemoteConfigService.FetchRemoteConfig are blocked." UserInfo={NSLocalizedDescription=RCN Fetch Failure: Server returned error:code: 403. Status: PERMISSION_DENIED. Message: Requests to this API firebaseremoteconfig.googleapis.com method google.firebase.remoteconfig.v1.RemoteConfigService.FetchRemoteConfig are blocked.}

The same issue is occurring for Auth.

Steps to reproduce:

Launch the App.

Note, prior to updating to the latest, from 4.0.0 all seemed fine and the live App is using that version…