Hi @tman , I’m afraid that won’t work and isn’t supported.
the setup is Active / Standby so traffic will only flow via the Active MX until that device fails over to the Standby device.
You would have to place the MX in another Network should you wish to utilise it but that would remove your redundancy and also incur the cost of having to license another MX
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.