Dial Plan to Match Asterisk "*" and Pound "#"

I’m trying to create a dial plan that will allow me to pass * and # through to my service and not be intercepted by FreePBX. I have a prefix setup to identify the outbound route. I have tried dial plans like:

[*#0-9].
[*#]X.

But I still get “No Dialplan Matched” when trying to send commands to my service.
Can anyone help?