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I'm trying to update the value of a UDF on an existing contact. This is what the body of my request looks like:

{
    "abEntry": {
        "data": {
            "key": contact["Key"],
            "Udf/$Name(Communications)": ["No political comms"]
        }
    }
}

I've tried sending the UDF value as an array of string, an array objects like {"Value"=>[{"Name"=>"No political comms"}]} and just as plain strings. But every attempt returns an error like "The given key is of a type not supported by the target object" or "invalid value".

How do I update the value of a UDF on a contact? Thanks