Business Days Card Not Linked

Trying to establish the relationship between the order date field in the sales table and the date in the claendar table to update the card with the respective number of business days when a monthn is selected.

https://www.dropbox.com/s/tzfs07cpd1nqcqe/OrderDate.pbix?dl=0

Also, when I add the relationship, the column chart changes from being grouped by months to each day and I can't change it back. Even tried using the month column, but that didn't work either.

Thoughts??