First off, you do not want to put the users DN in the DCFW field, put a CDN to a script or VM.
Change your CFW from 6 to 4
The Personal DN field in the CCMA user config should be the DN of the Phtm. In your case DN 8464.
When the agent logs in, CCMS will manage the CFW 4 key on the phantom and automatically port calls made to that Phtm to a SCR, SCN key on the users set.
DCFW prompt will be used for when the agent is not logged in.
FDN will be used for Call Forward No Answer.