Product Feedback: Messaging authentication limitation

Hello, 

The main limitation in this topic is accounts in Zendesk can have only one External ID. Currently whenever an end-user requests a messaging conversation and is authenticated, an account with External ID is created and if there is more than 1 brand - this creates additional accounts which then have to be merged into the main e-mail account. If for example, the end-user has social channels as well (like Facebook, X corp. etc.), this generates more accounts. 

A solution for this would mean a unified account which will improve agent experience. 

This impacts us on a daily basis and as a workaround, it is possible to utilize API calls to merge accounts, however this is not ideal as it can be done only with lower traffic and there is a limit to how much API calls we can make and they can be utilized more efficiently elsewhere. As a workaround of the workaround, we can get an API calls add-on, however it will have to be free of charge.

An ideal solution for this would be to remove External ID as unique identified and make it the same as in Chat product. 

Thank you.