Salesforce Digital Engagement: Enhanced Messaging Error Codes — Feature Parity Gap with Legacy LiveAgent

This is a known feature parity gap between standard (Legacy LiveAgent) messaging and Enhanced Messaging in Salesforce Digital Engagement. A feature parity gap means that a capability available in the older product version has not yet been replicated in the newer architecture.
In Enhanced Messaging channels, error information is surfaced directly within the Messaging Session record in Salesforce, through the Messaging Error Codes framework. Agents and supervisors can view error codes within the messaging session rather than querying the ConversationEntry object.
If you would like to see programmatic error access added to Enhanced Messaging in a future release, consider creating or upvoting an existing Idea on the IdeaExchange. The IdeaExchange is Salesforce's public platform for customers to suggest and vote on product enhancements.
Alternatively, you can ask Salesforce Support to reference the internal information section of this article and add your account to the internal tracking record for the Product Team's consideration.