Co-Admin can view another Co-Admin's content in Content Manager but As-User API returns 403

We have a Box Co-Admin account with the following permissions enabled:

• Manage Users

• Manage Groups

• View Users' Content

• Edit Users' Content

• Log into Users' Account

The Co-Admin can successfully impersonate regular managed users using the As-User API.

The same Co-Admin can also view another Co-Admin's files and folders through the Content Manager functionality in the Box Admin Console.

However, when attempting to access the other Co-Admin's content using the As-User header, the API returns HTTP 403 Forbidden.

Questions:

1. Is Co-Admin to Co-Admin impersonation supported through the As-User API?

2. Is the 403 response expected behavior?

3. If Content Manager can view another Co-Admin's content, is there a public API equivalent to Content Manager?

4. Is there a supported way to programmatically access another Co-Admin's content for migration purposes?

Any documentation references would be appreciated.