The Adobe Admin Console allows a system administrator to configure domains which are used for login via Federated ID for Single Sign-On (SSO). Once the domain is verified, the directory containing the domain is configured to allow users to log in to Creative Cloud. Users can log in using email addresses within that domain via an Identity Provider (IdP). The process is provisioned either as a software service which runs within the company network and is accessible from the Internet or a cloud service hosted by a third party that allows for the verification of user login details via secure communication using the SAML protocol.
One such IdP is Microsoft Azure, a cloud-based service which facilitates secure identity management.
The Azure AD uses the userPrincipalName attribute or allows you to specify the attribute (in a custom installation) to be used from on-premises as the user principal name in Azure AD. If the value of the userPrincipalName attribute does not correspond to a verified domain in Azure AD, it will be replaced with a default .onmicrosoft.com value.
When a user authenticates to the application, Azure AD issues a SAML token to the app that contains information (or claims) about users that uniquely identifies them. By default, this information includes a user's username, email address, first name, and last name. You can view or edit the claims sent in the SAML token to the application under the Attributes tab and release the user name attribute.