Unfortunately I’ve heard word from ADC that this is a specific limitation with Schlage locks due to their built in code limitations. Schlage locks must be set to receive a specific length of code rather than accepting up to a certain size, and sending any other length through Alarm.com has caused numerous syncing problems in the past.
ADC has purposefully removed the ability to send longer codes to Schlage locks because of this. Only 4 digit codes can be supported at this time.
Longer codes are still supported on other manufacturer models.