When configuring Nomad Enterprise with Consul Enterprise and multiple
namespaces, you need to include the `consul_namespace` mapping in the auth
method configuration. Otherwise you'll see an error like "unknown variable
accessed: value.consul_namespace". There's no example of the updated auth method
configuration you need, which makes this detail unclear when we're showing the
claim being used in the following `consul acl auth-method create` command.
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