Setting call forward button

[JoyceRogers]

I have a Panasonic KXT824 with a KXTVA50 voice mail. When I try to program call forward button to busy no answer to vm, it says "not valid" on display.
I tried it at several phones and same results. I can set CF follow me but that's it. Thanks

 

[obtsystems]

Are you using a 1 touch key with the 715 and VM number or

 

[JoyceRogers]

I am using the fixed call forward DND button on a KXT 7731
Then dialing 2 then 107 for vm then #

 

[madcowscarnival]

Would it be as simple as:

Lifting the handset/pressing intercom,

Press FWD / DND

Press "1"

Enter VM extension number {for this I had to use my second VM extension - i.e. 116 instead of 115, not sure why}

Press #, listen for confirmation tone

Hang up.

To cancel enter "0" for the extension number.