Dan231,
DND ON is probably correct in their assumption that the station flag System Forwarding is set to No.
System > Devices and Feature Codes > Phones > {your station} > Flags > System Forwarding
Another place to look is the actual Forwarding Paths itself to verify that their is one and that the correct flags have been set for it to forward the call when its conditions are met.
System > Devices and Feature Codes > Phones > {your station} > Forwarding Paths
Thanks,
TE