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.
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...)