Facebook often rejects products which don't go along with their standards, these often include medicinal products, products related to sexual wellness etc.
Once your products have been rejected you would not be able to use them.
You can check the rejected products by going to the Facebook dashboard. Rejected products filter will be available in the issues section on the right hand side as well have an error indicator on them.
Alternative to facebook catalog
We recommend that in such scenarios you don't rely on the Facebook catalog but build your own product cards using a carousel or a card layout provided by Facebook.
BIK provides easy way to build a product card layout. You can just select the SPM / MPM action and select the product which you want to send
If you have any questions feel free to reach out to us at [email protected] or via the live chat widget present on the dashboard.