Does it work fine when physically entering a code?
How old is the Lock, what about its batteries?
To troubleshoot, bring the panel within 6 feet of the lock . Remove the lock from the network, then re-add it. Leave the lock within 6 feet of the panel for about 10 minutes after adding so the lock completes secure enrollment.
Afterwards, put everything back and run a Z-Wave network Rediscovery. Any change?
Steps on how to do all of the above can be found here: