"Software has been working great for the last 9 years to submit feeds (tracking info, pricing, inventory etc) until the evening of 4/30/19. Nothing has changed on my end. I’m trying to trace the problem down but ultimately I get a “Bad Request” result from the MWS code. Running through debug, I am able to find a little more information in the ReportAnyErrors method of MarketplaceWebServiceClient.cs:
“<?xml version=\"1.0\"?>\n<ErrorResponse xmlns=“https://mws.amazonservices.com/”>\n \n Sender\n InvalidParameterValue\n Invalid query string provided - Keys may not contain <\n \n *** request id removed by me **\n\n”
Looking at my request, it’s just fine. I see nothing in it with a < or a <. When I look at the data that’s encoded and posted through http by Amazon’s code, I don’t see any either.
Anyone else having this issue??"