m… let my check if I understand.
First of all, I don’t have used Intel AMT , but I thinks that is something similar a BCM but instead of a separated chip/processor is inside the intel processor.
You have MAAS as a DHCP controller in the same network that is the Intel AMT. So the Intel AMT gets its IP address from MAAS.
The main problem, if when you restart or power on the machine, the Intel AMT shutdown, loosing its IP address so when the machine shutdown, it ask for new one.
You have three solutions, use a hostname of the Intel AMT (I don’t know if this is possible setup one), reserve a ip address for the MAC of the Intel AMT or setup a static IP address for the Intel AMT.
As an advise, for management systems it’s better to use a static IP address. And if is possible seppare the Intel AMT network from another different of the machine (Using VLANs, for example)