Can this issue be reproduced in different environments? If it can only be reproduced in the production environment, there is a high chance that the production server or gateway has a firewall or some filtering rules. You can check with your network engineer.

If the issue can be reproduced in every environment, especially if it can also be reproduced in your local environment, it is very likely due to some filtering rules set on the backend. You should focus on checking the project's startup configuration files, where you might find the issue.