From your explanation, I understand that the partner's environnements can't be made a copy of any our own environnements so they have some representative data and configurations ?
They claim that the developers and analysts cannot fully test in the same environnement they develop in and need a second one dedicated to testing.
They also claim that general support cannot use any of those environnements for figuring out issues in the published customizations as the different teams would be messing with each other work.
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