Source / Channel Group not showing in GA4 for scheduling conversions

I'm wondering if it's possible to see the channel / source of appointments book on Squarespace / Acuity Scheduling? All of the appointments booked online show as 'Direct' in GA4 but I know this is not the case (as have tested coming through Organic Search & Google Ads). 

I would like to know how many appointments are being booked from a source channel (such as direct, Google Ads, Organic Search, social etc) as well as the value of these appointment. 

I have set up the GA4 integration but it doesn't seem to work well. I didn't have this problem with UA.