Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hello Sietse,
Thanks for posting your concerns in the forum. You can import any schedules in Shifts app including holidays. However, usually we don’t suggest you import holidays in this way, because you need to enter the information like Shift Start Time, Shift End Time and Break(minutes). If you leave these information blank, you will have problems when importing the excel file. You can see here is the screenshot of the sample file.
I suggest you only import schedules via the Excel file and manually add Time off in the Shifts app. Thanks for your understanding.
Regards,
Rick