Can't add Zooz ZEN51 or ZEN52 devices

If you show us the FULL z-wave details page, top to bottom, we can fully access the situation. Otherwise just tossing out guesses.

Also for pairing new Z-wave devices I would highly recommend using SmartStart

You will just need to be aware if you want the device paired as Long Range or in Mesh mode, this app can help. [APP] SmartStart Manager for Z-Wave (Long Range support)

Docs:
https://docs2.hubitat.com/en/compliance-docs/zwave-manual#z-wave-plus-smartstart-devices-on-the-network