Looks like @dbadia spotted the issue - your network key is set to 512 bytes, or 16 blocks of 64 hex digits when OpenHAB and Z-Wave is expecting only 16 pairs of hex digits (16 blocks * 64 digits / 2 to a byte = 512).
Understandably, you’ve followed the instructions to replace ## with random hex digits from GRC’s Perfect Passwords random number generator to the letter, when what was intended was to take the first 32 characters of (say) the 64 generated by GRC and reformat them into 16 pairs like this:
zwave:networkKey=0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67, 0x89
I’d suggest going back to GRC, generating a new secret block of 64 digits and using the first 32 hex digits to give 16 fresh bytes (pairs like 0xAB) in the format as above.
Why this strange format? It’s a standard way of representing Hexadecimal in languages such as C and Java - see 0X - Wikipedia