For all who are having issues connecting their Shopify Shop to Facebook - I like to suggest that you stop trying and explore other alternative.
I've been having the same issues as the rest for weeks and I've finally managed to fix it.
Here are some of the steps to help you all:
1. Login into your Facebook Business Manager, and navigate to Catalogue Manager
If you previously had it working and now stop working. You should have some redundant catalogue lying around.
First remove any existing catalogue that you have.
2. Once you've removed all the Catalogue, begin to create a catalogue and go through all the steps required. Bear in mind, you will need to have a product feed for this. I used Facebook Product Feed (Flexify) for this and schedule feed refresh once a day.
Once you've done that, go back to your Facebook Page - Setup your shop section.
And it should be fixed.
This implementation is to fix Facebook Shop & Instagram Shop by using a manual product feed instead of the existing Shopify Integration that doesnt work and trust me, i've gone through all the steps everyone + support has advised
Hey If you guys go to page I believe 1 or 2 there is a post about how to fix this issue and it actually works and its super simple - All you have to do is add someone on your staff that has access to your shopify .. add them ad admin to your Facebook page , then have them go into your shopify to add the Facebook shop it will work! Cause it worked for me!!! super easy -
I think the issue is when Facebook started making all of us change on our Facebook business accounts to like an official business acc it removed us as the admin and made the "page" the actual admin.
Anyway check out page 1 or 2 of these comments you will find the solution!