Messaging for Web capabilities can span many different environments. The scope of Salesforce Support is to troubleshoot issues that are related to the setup of these products.
If Messaging for Web is not working within Salesforce via a Visualforce Page,Experience Site, or Basic HTML Doc (only including standard Embedded Web Service code snippet that doesn't have custom components configured), Salesforce Support can help troubleshoot issues.
It is out of the scope of Salesforce Support when issues arise from an external website but the previously mentioned items are working correctly.
If your issue is in scope, open a support case with Salesforce and provide the following: org ID, deployment name, reproduction steps, and browser console errors. If your issue is out of scope, work with your web development team to troubleshoot the external website configuration.
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