We have a hyrbid environment setup between Exchange 2010 and O365 for both mailboxes and Public Folders. Since putting Public Folders in hyrbid mode (through use of https://docs.microsoft.com/en-us/exchange/collaboration-exo/public-folders/set-up-legacy-hybrid-public-folders ) we keep getting reports every export cycle containing the below for each mail enabled Public Folders:
The reference attribute [AltRecipient] could not be updated in Azure Active Directory. Remove the reference [PublicFolder] in your local Active Directory directory service.
Does anyone know why Azure has an issue with the AD attribute that stores forwarding address', which I understand once the Public Folders are migrated can have this functionality enabled?