Comment 1 for bug 2058048

In the scenarios described, can you please include the actual juju commands run to add the machines? The bug says "Effect: It doesn't work" but it's hard to diagnose without knowing how the machines were added or app deployed. ie I am not sure why the default-space setting isn't working without knowing the exact juju commands used to deploy an app or add a machine.

It would be interesting to do another experiment. add-machine and deploy take a constraints argument. If not specified, it falls back to the model constraint.
So, this

juju add-machine --constraints "spaces=gamma"

or this

juju deploy foo --constraints "spaces=gamma"

would have the same effect as adding a model constraint "spaces=gamma" and omitting the constraint with the deploy. I wonder if using the above works for you.

Anyway, if you could provide more info that would be great. I'll mark as Incomplete for now.