Lambda Events not triggering EventBridge destination

I am using the Amazon Selling Partner API (SP-API) and am trying to set up a Pub/Sub like system for receiving customer orders etc.

The Notifications API in SP-API sends notifications of different types in 2 different ways depending on what event you are using. Some send directly to eventBridge and others are sent to SQS. https://developer-docs.amazon.com/sp-api/docs/notifications-api-v1-use-case-guide#section-notification-workflows

I have correctly set up the notifications that are directly sent to eventBridge, but am struggling to work the SQS notifications. I want all notifications to be send to my own endpoint.

For the SQS model, I am receiving notifications in SQS, which is set as a trigger for a Lambda function (This part works). The destination for this function is set as another eventBridge (this is that part that doesn't work). This gives the architecture as: SQS => Lambda => eventBridge => my endpoint

Why is lambda not triggering my eventBridge destination in order to send the notifications?

Execution Role Policies:

• Lambda
  1. AWSLambdaBasicExecutionRole
  2. AmazonSQSFullAccess
  3. AmazonEventBridgeFullAccess
  4. AWSLambda_FullAccess
• EventBridge
  1. Amazon_EventBridge_Invoke_Api_Destination
  2. AmazonEventBridgeFullAccess
  3. AWSLambda_FullAccess

EventBridge Event Pattern:

{"source": ["aws.lambda"]}

Execution Role Trusted Entities:

• EventBridge Role "Service": [ "events.amazonaws.com", "lambda.amazonaws.com", "sqs.amazonaws.com" ]
• Lambda Role "Service": [ "lambda.amazonaws.com", "events.amazonaws.com", "sqs.amazonaws.com" ]

Lambda Code:

exports.handler = function(event, context, callback) {
   console.log("Received event: ", event);
   context.callbackWaitForEmptyEventLoop = false
   callback(null, event);
   return {
      statusCode: 200,
   }
}