Hi Ronald Flex,
Thanks for your kind reminder.
As per your description, l checked in Outlook desktop app, yes, there is no American flag and the world flags in the category list.
Thank you for bringing this to our attention. l think it would be better if there is flag category and American flag. Therefore, I have taken the liberty to create an entry for you in the Feedback Portal **** No American Flag on outlook 365 why? · Community (microsoft.com), you can share your vote and comments there as well. Our product development team always pay attention to users' feedback. Hope this feature will be available in future updates.
Thanks for your cooperation and understanding. l hope you continue to enjoy our service. For other concerns, please feel free to let us know.
Have a good day.
Sincerely,
Tammy | Microsoft Community Moderator.