Share permission o

I have a mailbox where access to the calendar is granted with view permissions only using Outlook on my workstation. The problem is users can still make entries into the calendar and I am trying to figure out how. We are in a hybrid exchange environment with office 365. If I log into the office 365 admin portal and look at the mailbox in question I see all the users there with read and manage permission. What can I do here?
InSearchOfAsked:
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systechadminConsultantCommented:
can you please share screenshot of permissons which you have assigned to the user?
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Vasil Michev (MVP)Commented:
What's the output of

Get-MailboxFolderPermission shared@domain.com:\Calendar

Open in new window

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InSearchOfAuthor Commented:
Sorry I have been out of the office for a while. I will follow up on Monday
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