Hi Michael Liendo!
I think you have an error in your cdk routine, on line 49:
rule.addTarget(new targets.LambdaFunction(sampleFuncToAppSync)) I think the attribute/var that is passed to LambdaFunction should be "coffeeOrderReceivedFunc".
On the other hand, I have not been able to do something almost identical, in my case it is using the eventPattern aws.s3. the trigger is not added inside my lambda function, therefore it is not called when eventbridge detects the event from s3.
I've read a lot about this and am about to conclude that it's not possible to use addTarget on previously created resources from the amplify CLI, or at least not this command. This only works for resources created on the same CDK stack, apparently...
At the end of the Importing existing external resources section in /cdk/v2/guide/resources.html, says:
"Although you can use an external resource anywhere you'd use a similar resource defined in your app, you cannot modify the external resource. For example, calling addToResourcePolicy (Python: add_to_resource_policy) on an external s3.Bucket does nothing."
In your case, has it worked for you?
Thanks a lot and best regards.