I also have amazing news!! Mine is approved to! I emailed fb appeal and changed my domain, they them automatically sent me of for a review and I’ve woken up to a working Instagram shop!
the fact my fix was as simple as unlinking a domain and re linking will continue to confuse me as to why it’s taken fb 2 months to realise
I got great news you guys! we finally got approved!!
First thing i did was to make sure i copy the url and not type the website on our ig bio.
second was i checked the domains on my shopify account. i noticed that my domain didn't have the "www" so i typed it in.
then i went to verification on business manager and made sure that its www. and that my account was connected.
then i appealed again using the my domain was rejected but i want to change it and woke up getting approved.
Seems to be some differences how this problem manifests to each of us. I also read (and this is something true in my case) that use of some Instagram scheduling/management apps like Later etc. can be behind of these issues. No confirmation of course if this is the real root cause or part of it.
I got a step forward and got my catalogue approved, though still stuck as I cannot complete the integrations next step. After the catalogue is approved next step is to configure "set up Instagram Shopping" in the mobile Instagram app, but this brings me to random "no internet connection"- error. Struggle continues with FB support.
How the approval finally worked for me was:
1. Removed Catalogue in Facebook Business https://business.facebook.com/settings/ -> Data sources -> Catalogues
2. Removed the Facebook sales channel in Shopify -> "manage sales channels" after pressing the + icon in admin dashboard
3. New set-up of the Facebook sales channel in Shopify and thus creation of new catalogue in Facebook side
4. Using the IG Shopping Partner Support (facebook.com) to ask un-linking and copy pasting the URL of my 3rd party domain with the https
Hope this helps