I hope you can help me. It seems like all of you have the same issue that I am dealing with.
I recently tried to set up instagram sales channel for my site. I followed all of the steps. Facebook shows my correct business page, but instagram is linking to my personal page instead of my business page. Can anyone please tell me how to fix this problem?
If anyone is still stuck with this issue, I've managed to figure out what the problem was for me. Apparently my Facebook Store was not a shopping & retail store aned that's why it was deemed ineligible. I wrote a step-by-step guide on how I fixed the issue: https://www.shafquatarefeen.com/instagram-tag-products-shopify/
In regards to the original question...
I did this and it worked for me!!
All the info above is also correct....make sure no countries or ages are restricted and make sure you have your Facebook Shop set up.
Other than that, this is what I did:
1.) turn your instagram back into a Personal Account
2.) Unlink instagram from facebook, through the facebook settings
3.) Link your instagram to your facebook again, through the facebook settings
4.) Since your instagram is now a personal account, once you link your instagram again to your facebook it will prompt you with an option to go ahead and turn your instagram into a Business account; agree, fill out the info...and that did the job form me!
Basically its turning your Instagram from a Personal Account to a Business Account through facebook itself, not through the instagram settings.
I hope this helps someone!