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Reasons why the issue is happening
One or more of your products is missing the link template [link_template] attribute. When using the store-specific product page with in-store availability and price, you must provide a link template [link_template] with the shop code [store_code] ValueTrack parameter to all your local products. You can also add the optional mobile link for template [mobile_link_template] attribute to deliver an in-store product page that is optimised for mobile devices and to track mobile clicks.
Your link template must follow the landing page requirements for the store-specific product page with in-store availability and price feature. If you aren't able to provide a link template [link_template] with the shop code [store_code] ValueTrack attribute so that you can direct customers directly to a specific shop, you should opt in to a product page with in-store availability instead.
[ads_redirect] attribute in your product data source, you must include the shop code [store_code] ValueTrack parameter for both the ads redirect [ads_redirect] attribute and the link template [link_template] attribute.How to fix the issue
Fix products one by one directly in Merchant Center
Go to Products in the Merchant Center, then select the Needs attention tab.
Use the filter icon
above the table to find all products affected by your issue.
Click on the title of the product that you want to fix, then click Edit product.
Update those products' data to ensure the link template
[link_template] and ads redirect [ads_redirect] have a shop code [store_code] ValueTrack parameter.
Select Save.
Fix multiple products at once
Go to Products in the Merchant Center, then select the Needs attention tab.
Use the filter icon
above the table to find all products affected by your issue.
Select the download icon
to download a list (.csv) of all affected products for all issues or this particular issue.
Filter the downloaded report so that you only view products with:
'Issue title' = Missing value [link_template].
Update those products' data to ensure that the link template [link_template] and ads redirect [ads_redirect] have a shop code [store_code] ValueTrack parameter.
Re-upload your corrected product data to Merchant Center using your chosen upload method.