Sounds similar to https://bugs.launchpad.net/maas/2.9/+bug/1902425 which is reportedly fixed in the next 2.9 or 3.0 releases, any time soon now hopefully:
Auto assign IP not working
Sounds similar to https://bugs.launchpad.net/maas/2.9/+bug/1902425 which is reportedly fixed in the next 2.9 or 3.0 releases, any time soon now hopefully:
Auto assign IP not working