Well, if you don't see any issues in the Launchpoint and everything seems correctly set up as per the documentation but isn't working, you should create a support ticket with the Marketo team. The integraiton is pretty straight forward to setup, and once setup it works w/o any hiccups.
I identified the reason — the issue was with CRM sync permissions. Marketo lacked the necessary permissions to retrieve leads from Facebook. After rectifying this, leads are now flowing smoothly from Facebook to Marketo. However, I've encountered another issue: certain fields like Job Title and Company Size have picklist values. Facebook is automatically converting spaces to underscores (_) at the backend before syncing the details to Marketo, which distorts the data format. Currently, my plan is to set up data standardization campaigns in Marketo to rectify this issue. Do you have any additional recommendations or insights on how to manage this challenge effectively?