Comment 15 for bug 1923268

When you added the ARM64 machine are you including the boot MAC address or just the IPMI credentials? When you add just the IPMI credentials the machine actually goes into enlistment but MAAS detects its a known machine based on IPMI credenitals when the BMC is detected.

The associated branch updates the default grub.cfg file which is stored with all boot images. These files only get updated when a new image is found on images.maas.io or whatever your mirror is. To force the update you can run

sudo rm -rf /var/lib/maas/boot-resources/*
sudo systemctl restart maas-rackd