Each teammate gets their own credentials, such as a username, a password, a security badge, etc.
Each teammate knows how to manage their credentials securely, such as by using a secrets application.
Each teammate knows how to report their credentials as lost, or stolen, or otherwise at risk.
Credentials are confidential.
Credentials are creatable by doing process X.
Credentials are revokable by doing process X.
Credentials are testable by doing process X.
Credentials are delegatable by doing process X.