Zoom Event for Hubspot app join link doesn't synch

We just converted from Zoom Webinar to Zoom Sessions (Event) and are struggling with the Hubspot integration.

A workflow in HS neatly sends registrants straight into zoom from registering on a HS form but the data regarding the Join Link doesn't come back to HS. Thus making it impossible to nicely send out Hubspot emails with the participants Join Link. Has anyone else come across this? And if so, how to fix?