This forum is closed. Thank you for your contributions.
I'd ask in O365 forums here.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin?
or possibly in exchange forums here.
https://social.technet.microsoft.com/Forums/exchange/en-us/home?category=exchangeserver
Regards, Dave Patrick .... Microsoft Certified Professional Microsoft MVP [Windows Server] Datacenter Management Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.