Your server have dedicated IMM port on-board already, use only dedicated at the moment and the IMM cable should be physically reachable or router to the maas. Whats your maas network config?
network interface server - here
vlan81 network 10.20.81.0 (mngtm)
vlan82 network 10.20.82.0
vlan83 network 10.20.83.0
Maas UI:
Node interface:
