I have found a bug with setting up the calendars using Office365.
I tried to use the fridge to setup the calendar using Office365 and get a blank white screen. The Gmail option seems to work okay. If you use the Family Hub to setup the calendar it works fine
I appreciate your query & i try my best to recommend you the best solution to resolve RF56M9540SR/EU calendar issue office 365. If you want to resolve it with proper guideline then i suggest you to take advice from MS office 365 Support for more help.
thanks but but was not an issue with office365 but was resolved by a software update on the Family Hub. If you can help with the SmartThings app on the FamilyHub as Samsung have no fix for their own product !