A customer reports that their Avaya Aura Communication Manager (CM) enabled SIP telephones (AST) can only see the effect

[answerhappygod]

A customer reports that their Avaya Aura Communication Manager (CM) enabled SIP telephones (AST) can only see the effect of their telephone being Call
Forwarded after they log off and log on again. Also stopping the call forward feature does not show until their endpoint is logged off and logged on again.
What is the cause of the problem?

A. A coverage path has not been setup.
B. The Call Forwarding feature has not been assigned to a button.
C. Data Privacy is enabled in the station’s Class of Service.
D. An entry is missing in the private-numbering System Administration Terminal (SAT) form.