This is due to issues with Safari

• Install Chrome or edge on the mobile device 
• Change it to the default browser
• When you try and login, choose ‘Open in Edge\Chrome’ and the authentication will work.

or

https://docs.microsoft.com/en-us/answers/questions/93588/ios-14-mailcalendar-multi-factor-authentication-fa.html?childToView=104889#answer-104889

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The Outlook Application for IOS /Android can only be managed for mobile device management  in 365 not from on-premise exchange per this article

This means in the event of a device being lost or stolen that only have email synced via the Outlook Application , company data cannot be removed from the device.

You can disable this Active Sync Device for Downloading emails using the following method: 

https://practical365.com/exchange-server/block-quarantine-outlook-ios-android-app-exchange-server-office-365/

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Find the latest Firmware : https://software.cisco.com/download/release.html?mdfid=284846029&softwareid=282046477&release=3.3.0SE&flowid=45549

Setup TFTP Server ( Download : http://tftpd32.jounin.net/tftpd32_download.html )

Copy Bin file to TFTP Directory

3650-SW1#copy tftp flash

3650-SW1#Address or name of remote host []? 10.1.1.250
3650-SW1#Source filename []? cat3k_caa-universalk9.SPA.03.06.06.E.152-2.E6.bin
3650-SW1#Destination filename [cat3k_caa-universalk9.SPA.03.03.01.SE.150-1.EZ1.bin]?<enter>

3850-SW1#software install file flash:cat3k_caa-universalk9.SPA.03.06.06.E.152-2.E6.bin switch 1-4

The install should ask you to reload which will restart the whole stack ( All Stack members should run the same IOS ) 

If the SSH console disconnects during the install progress you will need to do an Manual Reload Command

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