SHow filtered booking calendars

Dear Support,
I have configured and inserted providers and services.
Now I want to insert into a page a calendar for 1 provider only.
I do it with the shortcode: [app_monthly_schedule worker=7]
The calendar show correctly, and when I click on a day it shows the available times.
But then, when I click on a time slot, nothing happens.
It should open the boking form!
Could you help?

Many thanks,
Francesco