What are you using to set lock codes? Which hub do you have and what version is it running? Which Schlage lock, BE469, BE469ZP, ???
In general, the stock Edge driver for Schlage is buggy and doesn’t expose all the features of the lock. I suggest using the [ST EDGE] Z-Wave Lock PH - Devices & Integrations / Community Created Device Types - SmartThings Community driver from @philh30. In addition to fixing many of the bugs in the stock driver, it exposes more features of the lock. The beta version of the driver in the same channel provides a capability to see how/who unlocked the lock as well as making that available as a trigger in Routines.