Hello,
Our devices do not support option 81 as clients, only as servers. However, the option 12 is being sent (we double checked it via Wireshark), so what you can do as a workaround, is edit your WAN interface (since that’s how you’re probably receiving an IP address in the first place) and change the Hostname to send when requesting DHCP:
This one is dependant on the server settings, more specifically, the lease time that is set on the server when leasing out IPs to the clients.
Regards,
M.