To resolve the Outlook desktop disconnection issue, you will first need to ensure modern authentication is enabled on the local machine. The below article will walk you through how to enable Modern Authentication as well as provide you steps for getting Outlook successfully reconnected:
How to enable modern authentication for Outlook to resolve end of basic authentication issue - How do I enable Modern Authentication?
To resolve the Mobile Device disconnection issue, you will just need to remove the current account from the device and then add it back:
- Iphone Configuration
- Android Configuration
* All versions of Outlook and Office that are still supported today support the use of Modern Authentication.
* All modern mobile devices, including iPhones and other iOS devices, as well as Android devices including Samsung and Motorola devices, support Modern Authentication in their native email client applications (including the Gmail app for all modern Android devices).
* Outlook for iOS and Android supports Modern Authentication and is the recommended email client for mobile devices.
* While IMAP and POP protocols now support modern authentication, this is intended for continued use of third-party applications ONLY. There is no plan for Outlook clients to support OAuth for POP and IMAP, but Outlook can connect using MAPI/HTTP (Windows clients) and EWS (Outlook for Mac). IMAP, POP and SMTP Auth
Check out the latest blog post from Microsoft on this topic.
This WILL NOT affect domains that are on our Hosted Exchange (Hex) platform.