Why am I receiving an "Error 401 - Unauthorized" message when accessing a Project if I am already a Team member for that Project?
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When a Resource does not have explicit rights (either granted by Instance, OBS or Global rights) to open a Project, being a Team member is not enough. It is necessary for that Resource to be a Participant, which will grant limited access to the Project.
Adding an Employee Resource as a Team member automatically adds it to the Project's Participant list, but being a Team member does not guarantee being a Participant. You can check if a Resource is a Participant by going to Project > Team > Participants with a user with sufficient rights.