Added note

Author: hmanwani-rh

assemblies/assembly-authenticating-with-rhbk.adoc

@@ -1,6 +1,11 @@
 [id="assembly-authenticating-with-rhbk"]
 = Authenticating with {rhbk-brand-name} ({rhbk})
 
+[NOTE]
+====
+{rhsso} 7.6 is deprecated as an authentication provider. You can continue using {rhsso} until the end of its maintenance support. For more information, see link:https://access.redhat.com/support/policy/updates/jboss_notes#p_sso[{rhsso} lifecycle dates]. As an alternative, consider migrating to {rhbk-brand-name} ({rhbk}).
+====
+
 To authenticate users with {rhbk-brand-name} ({rhbk}):
 
 . xref:enabling-authentication-with-rhbk[Enable the OpenID Connect (OIDC) authentication provider in RHDH].