This error comes directly from Amazon. When you receive an Andon Cord notification, it typically means one of your ASINs has been temporarily suspended from selling on the Amazon marketplace until customer complaints can be investigated and resolved, or that you have a shipment issue that needs to be acknowledged.
If you're unsure, you will need to reach out to Seller Central Seller Support to find out exactly what is causing it and to also get it resolved. The steps below may also help figure out what needs to be addressed.
For suspended ASINS, issues can focus on physical and functional defects or inconsistencies with the product page description. For instance, the physical item lacks a feature that was listed on the product page or its coloring is different.
You may have also received an email about this issue. The Andon Cord email, if you received one from Amazon, will list the customer complaints received for the ASIN in question. It includes a request for you to check your own inventory for these possible errors and confirm if they are an issue. If the complaint is related to a device’s function, the Amazon fulfillment center team might request quality-testing guidelines to check their in-house stock.
Check your shipments or inbound performance summary. There might be an issue there (such as sending in an overweight box) and you'll need to acknowledge it either on the summary page or shipment page before Amazon will let you inbound again.
If you don't see anything there, you can also try to replenish an affected ASIN already in your Inventory directly through Seller Central. You'll most likely experience similar issues that a Seller Support agent should be able to see and address if you contact them.
Once the issue has been acknowledged and Amazon clears this error from the MWS API we use to communicate with them, you'll be able to list again using Stratify.