1. Issue: Desktop page not crawlable due to robots.txt
How to fix: https://support.google.com/merchants/answer/6098185?hl=en#null
Some of your products specify a landing page (via the link attribute) that cannot be crawled by Google because robots.txt forbids Google's crawler to download the landing page. These products will remain disapproved and stop showing up in your Shopping ads and free product listings until we are able to crawl the landing page.
Update the robots.txt file on your web server to allow Google's crawler to fetch the provided landing pages. The robots.txt file can usually be found in the root directory of the web server (for example, http://www.example.com/robots.txt). In order for us to access your whole site, ensure that your robots.txt file allows both user-agents 'Googlebot' (used for landing pages) and 'Googlebot-image' (used for images) to crawl your site. You can do this by changing your robots.txt file as follows:
User-agent: Googlebot
Disallow:
User-agent: Googlebot-image
Disallow:
2. Issue: Mobile page not crawlable due to robots.txt
How to fix: https://support.google.com/merchants/answer/6101165?hl=en#null
One or more of your products specifies a landing page (via the link attribute) that cannot be crawled by Google because robots.txt forbids Google's crawler to download the landing page when crawling with a mobile user-agent. This prevents Google from performing automated quality and policy checks on product landing pages that ensure a seamless user experience. Affected products will stop showing in Shopping ads and free product listings for desktop and mobile devices until we are able to crawl the landing page.
To resolve this issue, update the robots.txt file on your web server to allow Google's crawler to fetch the provided landing pages. The robots.txt file can usually be found in the root directory of the web server (for example, http://www.example.com/robots.txt). In order for us to access your whole site, ensure that your robots.txt file allows both user-agents "Googlebot" (used for landing pages) and "Googlebot-image" (used for images) to crawl your site. You can do this by changing your robots.txt file as follows:
User-agent: Googlebot
Disallow:
User-agent: Googlebot-image
Disallow:
3. Issue: Unavailable mobile landing page
How to fix: https://support.google.com/merchants/answer/6098296?hl=en#null
For one or more of your products, you’ve submitted a landing page (via the mobile_link attribute) that cannot be accessed by Google when crawling with a mobile user-agent, which means it also may not be accessible to Google users who use mobile devices. If the landing page that is linked to your ad or listing is not available, it is both a bad user experience and a bad return on your ad spend, so we disable products that have an unavailable landing page.
These products will stop showing in Shopping ads and free product listings for desktop and mobile devices until Google is able to access the landing page. To resolve this issue, identify and fix the error to make sure your landing page is accessible from any device (including mobile devices), location, or browser.
4. Issue: Unavailable desktop landing page
How to fix: https://support.google.com/merchants/answer/6098155?hl=en#null
For one or more of your products, you’ve submitted a landing page (via the link attribute) that cannot be accessed by Google, which means it also may not be accessible to Google users. If the landing page that is linked to your ad or listing is not available, it is both a bad user experience and a bad return on your ad spend, so we disable products that have an unavailable landing page.
These products will stop showing in Shopping ads and free product listings until Google is able to access the landing page. To resolve this issue, identify and fix the error to make sure your landing page is accessible from any device, location, or browser.
5. Issue: Shopping Ad Violation Policy
How to fix: https://support.google.com/merchants/answer/6109185?hl=en
6. Issue: Product Data Quality Violation
How to fix: https://support.google.com/merchants/answer/9227009?hl=en
7. Issue: Incorrect Price & Availablity
How to fix: The fix is simple. You need to keep your prices updated. You can make a separate sheet for the discounted products and make a fetch from the original Google sheet. When there is a sale or promotion, you should change the sale price and not the actual price of the product.
8. Issue: Invalid images, Product titles, & Description
How to fix: The first step is to check the official Google Merchant Center guidelines. Make sure that your titles and descriptions comply with them appropriately. The most common mistakes are -> Too long product title, too long/short description, invalid image URL, special characters in your image, name or any other text, repetition of words in your product description, etc. Check all of these mistakes if there’s nothing wrong with your feed.