SFB Sign-In Troubleshooting For Hybrid Users
If customer is reporting that one or more SfBO accounts which were initially created in SfB/Lync on-premise and moved to O365 via the Move-CsUser command are not able to sign in to O365. When the environment uses a shared SIP address
(Hybrid) all authentication will initially be directed to the on-premise FE or Edge. The user is determined by the on-Premises deployment to be homed in O365 and redirected for authentication.
Internal sign-in issues in the hybrid mode Example: From Corpnet, VPN