Hello,
i installed WorkingHours directly from the Microsoft Store, logged in with my microsoft business account. (Win21H1) After testing it I am really content and want to buy the Pro-Version.
Unfortunately, when clicking the "Purchase" Button, i receive the error message, that I can not be logged in. 
I suppose, this is due to the business account? (We do not have special group policies that would block the purchase)
-When buying the license via gumroad, is it possible to use the Microsoft Store App with this license?
-And is there a way to get the discount, that is available in the Microsoft Store?
-Will I receive a proper invoice for the purchase via gumroad?
Thanks in advance for your help and for creating this simple yet effective timer!
Best regards!