Using Outlook for iOS for personal email and calendar management
Hi Carol Penny,
Thank you for posting in Microsoft Community, we are glad to assist you here.
Based on your post, we understand you are unable add your M365 account to Outlook on your new mobile device.
To address this issue, can we know where did you install the Outlook app from? Can you try to reinstall it and setup your M365 account first ?
Outlook for iOS and Android | Microsoft 365
If issue persists, we suggest you to contact the specific support team for Outlook iOS as following below steps:
Thank you for your understanding and co-operation, and we looking forward your update.
Regards,
Microsoft Community Moderator