Is there anything special I need to do? I have an active call the conversation clearly exists I can run the get conversation API etc but when I test this API I'm getting the following error:

{
"message": "Conversation XYZ does not exist.",
"code": "resource.not.found",
"status": 404,
"messageWithParams": "{entity} {id} does not exist.",
"messageParams": {
"id": "fbf09b5d-ee05-4abb-9799-540187e1ba22",
"entity": "Conversation"
},
"contextId": "e6a58f37-c7ab-48f2-80ae-e8ed57fa0ff6",
"details": [],
"errors": []
}

This one only functions while in-queue. Anything that I can use that doesn't have that requirement?

Hello,

That's correct.
This API endpoint will allow you to update attributes of an in-queue conversation. Supported attributes: skillIds, languageId, and priority.

Regards,

I believe this could be used please confirm
PATCH
/api/v2/routing/conversations/{conversationId}

We understand that a set skill action can be used while a conversation waits in a queue to add skills. We also recognize that you could perform this in a flow through a number attached to an external contact. We are looking for either the API being used for setskill action or an API that will allow us to do this in a live conversation. Hopefully, you can help.