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Why this issue is happening
Automatic item updates for availability are currently not available for your account in the selected country because the availability information you submit in your product data and the availability information in the schema.org microdata on your product landing pages differ too often. This can be caused by several factors, including not frequent enough updates of your product data in your Shopping ads and free listings (compared to your website) or systematically different availability states.
When automatic item updates are enabled, the availability information in your product data is based on the schema.org availability microdata on your product landing pages. To ensure that updates are done correctly and the information shown is correct, we require a minimum match level between your product data and the schema.org microdata on your landing pages. If this requirement is not met we stop automatically updating products until the match level has reached the required minimum.
Note that automatic item updates isn't a replacement for frequent updates of your product data. It is designed to detect and fix problems with the price and availability accuracy for your products up to a certain extent. If too many of your items appear to be inaccurate, automatic item updates will stop working and your entire account will be at risk of suspension. If you perform frequent updates of individual products you might want to consider the use of the Content API instead of data feeds.
How to fix your issue
Review the microdata on your website. Check for mismatches between your microdata and your Merchant Center product data. You can use the Rich Results Tool to help you debug any issues. Note that providing incorrect microdata on your product landing pages is a violation of our web developer guidelines.
Other common sources of mismatches are price ranges and variants. If there are multiple variants shown on the landing page, you can use the ID [id] or the GTIN [gtin] attribute to specify which variant a price corresponds to. Learn more about structured data markup for Merchant Center
Next steps
Resubmit your data and continue to provide accurate information matching between your microdata, website, and Merchant Center product feed. Google will continue crawling your website and comparing your Merchant Center product data and when we're sure that the issues are fixed, AIU will become active again. This may take several weeks.