So I've been having a similar issue... But mine is when I have a calendar/meeting entry. The phone number along with the passcode and a subsequent # to "send" the passcode is correct in the calendar entry.. So it looks like 1-800-123-4567,,,1234567#. I can select it, but the dialer then converts the commas into a semicolon. After dialing the number, the dialer prompts me to send the passcode, but doesn't include the # at the end. I've been able to do this successfully in the past, but do not recall it working correctly for the last couple releases of Android... Since 4.4 maybe? Didn't pay that close attention, as I wasn't using this capability so much.