Juju 4 fails to create models on Azure

[Jack Shaw]

This recently started occuring in Juju 4

```
$ juju bootstrap azure azure
...
$ juju add-model m
ERROR Failed to perform spaces discovery: GET https://management.azure.com/subscriptions/2eebf55a-1e02-45d8-a299-02aed8aea00b/resourceGroups/juju-m-3cd30c01/providers/Microsoft.Network/virtualNetworks/juju-internal-network/subnets
--------------------------------------------------------------------------------
RESPONSE 404: 404 Not Found
ERROR CODE: ResourceGroupNotFound
--------------------------------------------------------------------------------
{
  "error": {
    "code": "ResourceGroupNotFound",
    "message": "Resource group 'juju-m-3cd30c01' could not be found."
  }
}
--------------------------------------------------------------------------------
```

And afterwards
```
$ juju add-model m
ERROR failed to create model "9596a5bf-9863-4c78-850c-4bc232b6c284": creating initial model "m" with id "9596a5bf-9863-4c78-850c-4bc232b6c284": model already exists for name "m" and owner "30ecfe84-8896-40ed-8ba3-283237f06c35"

$ juju models
Controller: azure

Model Cloud/Region Type Status Machines Cores Units Access Last connection
controller azure/centralus azure available 1 1 1 admin just now
```