Locales API always returns "The resource could not be found." now

Hello! I’m stuck by the issue caused by locales from management API collection.
GET: https://api.contentful.com/spaces/SOMESPACE/environments/SOMEENV/locales
We have two locales set for this space, but the API always returns “The resource could not be found.” error.

{
	"sys": {
		"type": "Error",
		"id": "NotFound"
	},
	"message": "The resource could not be found.",
	"requestId": "ad772360-5733-46ba-8571-3265eb95def3"
}

This is the first API call when using .NET SDK if no locale assigned. So it is a quite critical issue for me. It stops GetEntriesForLocale() from working.