Use of PUT Shift to Repeat the shift

I'm attempting to use PUT Shift to repeat a shift that I've created using POST Shift and GET Publish. The intention is to have it repeat all weekdays from the date of the original shift to a specified ending date.

I see in the documentation that there are about 7 different body parameters related to "repeat" but so far nothing I've tried seems to repeat that original shift to different days of the week.

Here are some of the values I've tried, but hopefully you can provide more guidance into what the values of the different parameters should be or if I should be using something else entirely:

repeat = 1
repeat_until = 2019-02-08
repeat_staff = 2
repeat_cycle = "Mon - Fri" (in the GUI)