I’m trying to run a test for a project using AWS SNS but I’m a little lost using filters:

foreach (var hobby in attributes)
{
    publishRequest.MessageAttributes.Add("Hobbies", new MessageAttributeValue
    {
        DataType = "String",
        StringValue = hobby
    });
}


// Publish the message to the topic
await _snsClient.PublishAsync(publishRequest);

Using this JSON as my request:

{
“Body”: “Hello subscribers!”,
“Subject”: “New Content for users Available “,
“Attributes”:[“Games”,”Coffee”]
}

I get the following exception: “System.ArgumentException: An item with the same key has already been added. Key: Hobbies”

My subscriptors filter policy look like this: “Hobbies”: [
“Travel”,
“Home”,
“Coffee”
]

How could I send the email for the subscribers that have the Attributes the request send me?