I am using Office 365 through with the full suite of Microsoft Office programs on my desktop. I have just downloaded and installed Teams It will not register in Outlook Calendar in spite of trying Administrator and non-Administrator start up. In Teams I can access all my Outlook contacts to make calls BUT Teams Chat will not read any Outlook contacts which is crazy if it will read the contacts and their phone numbers in Calls. The first three characters of a contact name simply returns a none found message, yet there's the contact and their phone number in Calls. Coincidentally signing into Teams using the iPad Pro app won't read ANY contacts at all.