adding Anonymous back to Outlook Calendar permissions

The standard entries in a user's Outlook calendar permissions are "Default" and "Anonymous" , we have some users that deleted the "Anonymous" entry. I would like to get it back so I can explicitly give it permission level of "none" but I cannot add it back from the Calendar Properties window. Is there a script or other way to do this?

I am using Office 365 and all of our mailboxes are in the Microsoft cloud.
John WaterAsked:
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Vasil Michev (MVP)Commented:
Simply add it via PowerShell:

Add-MailboxFolderPermission user:\Calendar -User Anonymous -AccessRights None

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John WaterAuthor Commented:
just want I needed, thank you
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John WaterAuthor Commented:
I attempted this and found that I was premature in assigning the Best Solution - I ended up with the error "There is no existing permission entry found for user: Anonymous

Any other suggestions
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John WaterAuthor Commented:
disregard my last entry, Masil Michev was correct, I add use the "set" instead of "add" I corrected and all worked as I needed.
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John WaterAuthor Commented:
Sorry, That Should have be Vasil Michev (MVP) was correct. No disrespect intended, just a typo. Thank you Vasil Michev (MVP)
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Vasil Michev (MVP)Commented:
So, did you solve the issue or need more help with it? :)
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John WaterAuthor Commented:
thank you.
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John WaterAuthor Commented:
Issue solved
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