All user permissions are managed in the Adobe Admin Console
(https://adminconsole.adobe.com) and the documentation can be found
here. Projects and credentials are owned by the organization as opposed
to individual users. As such all System Admins have access to all
projects/credentials in the Developer Console. Developers have limited
access based on the access that was granted to them. Management of
Developers can be found here. Please confirm that your colleague and you
are logging into the sa...