No obvious space

I am trying to add-machine a new container for an application. The host machine has an interface on the requested space, but juju seems not to understand it with the error:

host machine “244” has no available device in space(s) “os-internal”

The initial command is

juju add-machine -m openstack lxd:244 --constraints spaces=oam-space,os-internal

The same host machine (244) already has units of other applications in that space and I have also confirmed in the DB that this machines addresses has information for the os-internal space.

Any suggestions ?