Thanks for jumping in to this thread, and sharing more details on the error you're receiving.
I'm sorry to hear that you haven't had further help with this from Shopify, or Facebook, and I'd like to lend a hand.
When this error appears, it means that the Instagram account that you're trying to link to your Facebook Channel in Shopify is already tied to another Facebook Commerce account. In order to resolve this, the other account must be deleted by Facebook. Then, you'll be able to link your Instagram to the correct Facebook Commerce account in Shopify.
I know you mentioned that you've already tried to speak with Facebook about this, but I do recommend contacting them again via their Business Help Center. This is the best way to speak with them directly, and get their help with deleting the other Facebook Commerce account.
Keep me posted on how this goes!
Awesome! I'm glad to hear that you've already contacted Facebook.
Their Business Help Center is the best way to reach them directly, so now that you've contacted them there they should get back to you shortly with more information.
Let me know what they say!
Thanks for letting me know about this error.
You mentioned that when you share your URL, your items are visible on your online store. However, based on the error message you're receiving, I do recommend double checking this to confirm. To do this on each individual product, you can follow these steps. To complete this in bulk on all of your products instead though, check out these steps:
If this error is still appearing in your admin once you've complete these steps, please reply back to me here with a link to your live site so I can take a closer look.
I hope to hear back from you about this soon!
I'm happy to help with the issue you're having.
Can you please confirm exactly what's happening on your end? Are you receiving a specific error message? If so, feel free to share a screenshot of the error with me here so I can take a closer look at this.
I look forward to receiving more details from you!