Couple of things:
- If you’re using a Z-Wave module, the 28.11 hub firmware has an issue with non plus devices which may render it non functional. You can wait until they release the patch and see if that helps.
- If you have access to RBoy Apps, you could try using a custom device handler specifically built for Yale locks like this Enhanced Universal Z-Wave Lock DTH.
- Reboot the hub, bring the lock within 5ft of the hub and then try to pair it.