I created a shared mailbox using the Exchange shell and the -shared command for a shared calendar. I have given two groups permissions to this mailbox. One group should have full access and the other group should have read only permissions. Everything was done via the shell.
Nobody in either of those two groups can open the shared calendar. No matter what I do, it doesn’t seem to work. I can’t figure out what I am doing wrong. If I add a single user via the add-mailboxpermission cmdlet with full access, it works right away giving them full access.
Any thoughts? I have been trying to figure this out over the past 5 or 6 days searching everywhere for answers.