It would seem like whether it’s supposed to or not, the Gocontrol Siren is not repeating… It may also be having a signal issue reaching the lock.
Keep in mind that it’s not just about distance, there may be other factors such as interference (especially passing through floors) that impacts signal.
The locks work best when they can easily reach a device that supports the ZWave beaming feature (see this article: FAQ: Pairing Schlage Z-Wave Locks)
I use the GE Zwave plus switches for this, I have one in the light switch box next to my door.
Read the linked article and look for a good repeater device that supports beaming and ensure its installed CLOSE to the lock on the same floor.