Connect to existing domain on certain items

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Last week certain items on my website wouldn't show up and instead I got this message to

Only one step left!
To finish setting up your new web address, go to your domain settings, click "Connect existing domain", and enter:

I did this as well as a Shopify expert but nothing hss changed. If it was all my items that I have listed for sale it might make more sense but it varies throughout my various collections. Some items on sale on my website open properly while others have the above message. It was a lot of work to set these up and I would prefer not to delete each item that doesn't work and re-do it. I did for one to try and it worked fine but there are probably over 100 to redo. Any ideas on what happened and how to fix?

I had this domain since January with no issues