Google Ads With New Conversation Started Column For Message Assets
Briefly

"Google has rolled out a fresh conversion action: 'Conversation Started'... A click on the message extension on your ad results in a message sent, and Google will report a conversation was started."
"Yes, confirming that you'll see this when using message assets. A click on the message extension on your ad results in a message sent, and Google will report a conversation was started."
Read at Search Engine Roundtable
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