Step 1: Identify if This Is the Case
Go to Google Merchant Center and navigate to the Diagnostics > Item issues tab. Check if there is a mass disapproval of the type “Product page unavailable” mentioning an internal server error (500). Manually test the URL of one of the affected products in your browser. If the page loads normally, it means the instability has already passed, but Google has not yet re-verified.Step 2: Request Site Verification
Before requesting verification, confirm that the product pages are already
loading normally. If you request verification while the issue is still active,
Google will find the same errors and you will have to wait 12 hours before
requesting again.