Don't use the "conversationId": 6271905464763260000. It is deprecated and present only for legacy purpose. Use the "id" in the "conversation" object instead.
Sorry, I should have mentioned that I tried that too and is also returns zero results.
Are you saying that If I use the ID in the conversation object as an argument in the API call for Conversation ID I should return the records from that conversation? It also returns zero record results.
That also returns no records
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