Streaming live at 10am (PST)

Calendly pre-fill not working

Hi!
I’m using Calendly, and it works. However, I would love to prefill the form in Calendly, and there is a guide to do so here: https://help.calendly.com/hc/en-us/articles/226766767-Pre-populate-invitee-information-on-the-scheduling-page
I’ve managed to make the url look like this, using custom code: mywebsite.com/book-meeting?name=MyFirstname%20MyLastname&email=myemail@test.com
But for some reason Calendly is not pre-filling the form.
Is there anyone else, who has tried this and made it work?
Thanks!