



Hello,
Can you please confirm whether App Engine Admin API is enabled as it is required by App Engine predefined roles which includes App Engine Code Viewer.
If the App Engine Admin API is enabled this behavior may be related to your browser history. Please try to clear your cache and delete any cookies related to Google Cloud Console. After that try to log in into your Cloud Console from an Incognito Mode and share and see if the issue gets resolved.
If the issue persists, I would recommend you to create an App Engine Public Issue under the “Compute” section by going here as the issue may be required to refer to the App Engine Engineering team to resolve it. Please select the private component as probably you will have to share project specific information, so that it is not visible to the public. One of the Google Cloud Platform Support Agents will assist you to resolve your issue.
You can share the link of this Google Cloup thread at the Public Issue as reference.
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