Add Microsoft 365 to Add to Calendar drop down list

Users of Microsoft Office 365 are unable to add to calendar after registering for a gotowebinar.  Roight now the options are google, outlook, outlook.com, and ICS.  None of those options work for outlook 365 web users. 

When we use other webinar services that have Microsoft 365 as an option under Add to Calendar, users can add heir registration to calendar seamlessly.