Please note that if you are in the closed MX IPv6 beta program, you should not upgrade to this public beta version.
Do you know when the ability to use madatory DHCP and WAN failover threshold configuration will be available for this beta version?
This is currently gated. If you wish, you can call support to enable this in your organization.
"Added firmware support for configuring how flows on a secondary uplink should be handled after the primary WAN uplink becomes available again."
Where can this be configured?
This feature is called the "Enhanced WAN failover and failback". Only enabled via Meraki support.