Since version 3.0 of the SAML SSO app for Jira, Confluence, Bitbucket and (Server and Data Center) and Bamboo Server we have included a new functionality called User Sync, which adds the functionality to synchronize users & groups,
as opposed to only the "Just in Time" provisioning which is supported by our app for many years already.

We are still in the process of updating tutorials & videos to reflect the new functionality.
Please find below links describing the setup of User Sync with the identity providers currently supported by it,
as well as some other useful links and articles.