MCStacker/tips/en/settings.namespace.txt

This setting will place a namespace on some commands such as /setblock, /fill, /give and /effect. Usually a namespace is not required. If required it's normally set to 'minecraft' but it can be set to something else. This setting does not affect namespaces inside generated NBT. They are all hardcoded to be 'minecraft'. This setting is only for the namepace outside of the NBT.