CallTower Support is aware of an intermittent issue with a limited number of Skype for Business (SfB) customers. Affected SfB clients may not allow users to log in or connect. CallTower Engineering is investigating the issue and working on steps to resolve. As remediation is performed, there is a possibility of SfB clients disconnecting and automatically reconnecting during the move.
If you believe you are affected by this issue please contact firstname.lastname@example.org