Go to your online store tab, then domain tab. And top right corner you’ll
see a button that says change primary domain.
Hope that helps
Hi There,
Did this work for you?
Hi, yes it did
Thank you 
can you be more specific? the shopify page or the facebook manager?
Shopify page.
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Hi there! So I figured this out. If your products are linked to a separate domain it will pop that error. I had previously had a domain but it changed but Instagram still had my old website. Here is where to change that! Click on website under shopping and you can update the website! I found this by accident and I couldn’t find the answers online.
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Three cheers to the previous reply!!!
HOORAY! HOORAY! HOORAY!
Here is the exact menu order:
[OPEN SIDE PANNEL]
SETTINGS > BUSINESS > SHOPPING > WEBSITE
“And boom goes the dynamite!”
(still keeping my toes crossed, as my domain has yet to officially be verified…)
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It took them less than a day for them to verify mine! I have no issues now!!
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This was so helpful. THANK YOU!
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On your mobile device, go to settings > business > shopping > website and you should be able to click on your new domain name or click “verify other website in catalog”. I was then able to tag products again. As a fist step make sure you have already verified your new domain on Facebook business manager and you shouldn’t have any issues. I deleted my old domain name on Facebook business manager to avoid any confusion.
Good luck!
Go to setting which is under your profile page of Instagram and click the 3 lines and click setting then business, then shopping, finely Website, snd choose the website that is in your catlog
hey any solution i did the same thing i changed domain than request and it says domain not approved any solution ?
Go to setting which is under your profile page of Instagram and click the 3 lines and click setting then business, then shopping, finely Website, snd choose the website that is in your catlog
Guys, just go to brand safety - domains - and delete for domain, and add it back again, then re verify using your preferred method. 
Hope this helps, it worked for me just now!
That’s so odd because I started with my custom domain and waited days and day and nothing. So I clicked the verify button in Instagram again and it said I needed to use my shopify URL. So I put that in and was approved instantly. But then I try to tag stuff and I can’t because it says it’s not linked to the right URL. sigh so now I need to go back to where I started? They never approved my custom URL they’d only approve the shopify one
i unlinked my fb and instagram accounts and then I removed my commerce account from FB. And then I disconnected my FB and IN shops from Shopify. And then reconnected everything and it finally worked. Basically, I pulled the plug on everything and started over.
just kidding, it did not work. still cannot tag anything.
https://www.youtube.com/watch?v=etzPgNHnAJY this video helped me with that issue
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This worked for me, Thanks so much!