We see several requests for enabling Single Sign-On between multiple DHIS 2 instances (and other systems, too), i.e. the ability to manage the user account (password, status) in one place and be able to sign in once and automatically be signed into multiple DHIS 2 instances.
This can be achieved by setting up OpenID Connect (OIDC) with an identity platform such Azure AD, Google Identity, Keycloak or Okta. You can find install docs here and a tutorial for Okta here: