It is possible that another user is programming buttons, or another is in programming, the BCM only allows one session at a time to access the Telephony settings.
I was reading the original question as trying to program the internal dial extension, which is done in configuration/system programming. On reading again it does look like trying to program internal auto dial buttons. The only thing I can think of that would give an access denied message is if the set had an active call on hold or a call was ringing at the set while trying to program the buttons.
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