Microsoft Exchange modern authentication on an MacBook Pro late 2011

I have been trying to add a Microsoft Exchange account to my Mail app through modern authentication, but it looks like I cannot do it in my MacBook. I cannot update from macOS High Sierra 10.13.6 and the earliest I can use with modern authentication is 10.14: https://support.apple.com/en-gb/guide/deployment-reference-macos/apd46055de62/web. I wonder if anyone would suggest any alternative?