Got the answer. The category names are case sensitive on Mac. Where as a name of "Blue Category" works on outlook on Windows, but not on Mac, "Blue category" does show up both on outlooks on Mac and Windows.
Outlook on Mac not showing up Categories set through MS Graph API

Sudharshan K
1
Reputation point
Hi Team,
I'm changing mail message category using MS Graph api (eg: "Blue category"). I am not able to see the corresponding email marked as "Blue" on outlook on Mac. Where as I can see the change reflected on Outlook on Windows.
But, when I query the Messages on Graph api explorer, I can clearly see the categories are set for the mail message.
Can you please help, if this is a know issue or we need to do something in addition to see the change reflected on a Mac.
Thanks in Advance,
Sudharshan