Can you append to the 4.0 release notes something like

SAML users may need to update their username mapping to match user emails.

after

The username artifact has been removed in favor of the more recognizable name (Full name). As a result the email artifact is now used for uniqueness in Fleet. Upon upgrading to Fleet 4.0.0, existing users will have the name field populated with username.

? Didn't notice this issue until our sessions expired

Thank you. Updated on the release page and in https://github.com/fleetdm/fleet/pull/1328.