Hi,
Do you mean that the command only work when running in the SFB Mgmt shell but failed in PS?
If so, it is normal as the command is applied to SFB server so it is only available in the SFB Admin tool (Mgmt shell).
If it is not the case like I mentioned, please help further explain it or provide the snapshot of the error reported if possible.
Some reference:
https://blogs.technet.microsoft.com/jenstr/2011/02/07/grant-cssetuppermission-and-grant-csoupermission/
Kind regards,
Calvin Liu
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