Click the link below to see how to add this to your iPhone:   

https://www.macrumors.com/how-to/subscribe-to-calendars-on-iphone-ipad/

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you will need to copy this link first:  

 

https://outlook.live.com/owa/calendar/a416fbba-c196-4d77-afa4-26fbf937324a/dafad5a9-a90d-4ae1-bb49-f7d721b455b2/cid-B24C98100A96B471/calendar.ics