All warnings should be responded to, especially those claiming inauthenticity, because all warnings increase your perceived risk as a seller to Amazon.
Thoughtfully responding to these warnings will help you maintain your reputation as a caring and invested seller on the Amazon platform.
The teams evaluating sellers have a short period in which to look at each individual account, and you want the notations on your account to show that you react swiftly and decisively to customer issues, and sometimes without being prompted.
Cascadia Seller Solutions has deep dive corrective action plans to evaluate problems and provide proactive and thoughtful solutions to Amazon to protect your investment. A warning response is maintenance on your account, and typically takes no more than an hour.
You may see a variety of policy warnings, from potential listing price errors to restricted products to packaging defects to concerns about used items being sold as new to inauthenticity concerns.
Some do not need a response, such as pricing errors or restricted products (at this time), but any performance or quality warnings need to be investigated and responded to, with a request in your submission to annotate your account with your actions.