Juju not able to spin up lxd container

I’m trying to setup a three node mysql-innodb-cluster on a maas-deployment using juju.

The setup process worked flawlessly and the deployment of other charms worked fine. When deploying the cluster I would like to achieve that in separate lxd-container. But that doesn’t work. I get the error:

Did I miss some critical configuration step here?

closing this one since it sounds like a juju issue, not MAAS.