You may want to block outlook 2010 and notify admin of the client that requires upgrade to 2013-2016.

the below articles should help to achieve that.

Block Non-Modern Authentication Access to Office 365 Exchange        

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/dn592182(v=ws.11)

How modern authentication works for Office 2013 and Office 2016 client apps

https://docs.microsoft.com/en-us/office365/enterprise/modern-auth-for-office-2013-and-2016