Outlook calendar sharing problem on Mac

Weird phenomenon here ... I'm trying to share an Outlook 2016 calendar from person A with person B's Mac:

- the shared calendar is visible in person B's web mail interface
- it's not visible in person B's Outlook 2016 for Mac interface
- it's not visible in person B's iCal

Even after having clicked on 'accept calendar' and then 'show calendar' in Outlook 2016 for Mac on person B's Mac it simply switches to display the default calendar, the shared calendar doesn't appear ... (except, as indicated above, in the web mail view)

Any ideas!? Thanks!
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