Hi, I am trying to create a workflow to grant users FullAccess to existing shared mailboxes (exchange on-prem) by adding SID to the attribute edsva-MsExch-SharedMailboxUsers but it keeps returning error "Operation is not valid due to the current state of the object" when the WF runs.
If it get it to use Set instead of Add it works fine but Set replaces all the existing users with the new user which I don't want to do, I want the new user to be added alongside the existing FullAccess users
