Third Party Product Publishing

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Hello, I have a problem. I'm trying to publish and managing my product but there's more than 100 styles and it will take a long time to publish it. So I'm using a third party inventory but when I'm trying to publish a product I always get an error saying "Cannot read properties of undefined (reading 'headers')" and "504 - "<html>\r\n<head><title>504 Gateway Time-out</title></head>\r\n<body>\r\n<center><h1>504 Gateway Time-out</h1></center>\r\n<hr><center>nginx</center>\r\n</body>\r\n</html>\r\n".

I already confirm it with my third party customer service, but they said the problem was from the shopify server. Can someone help me?