How to Recover Contacts on Mobile Device After Migrating to Outlook
1. Open your Outlook app and press the top left icon with your profile picture
2. Open the cog icon on the bottom left
3. Enter your TTI Office 365 mail account settings
4. Turn on the option to save contacts. It may take a while to transfer the contacts so don't panic, and after it's done, you'll have all your contacts on your phone.