AWS Lambda with AWS MSK trigger - Role and event source must be in the same account as the cloud function

Question

I'm trying to deploy a Lambda function which is triggered by AWS MSK Kafka. I came across this error - Role and event source must be in the same account as the cloud function.

Does this mean that the AWS MSK and the Lambda must be under the same account ? Isn't there a way to workaround that?

And in case there isn't a workaround:

1. will implementing an in-code Kafka consumer work?
2. what's the recommended way to trigger it? cron expression perhaps? as I won't be aware if new messages arrived to the topic.

Thanks in advance.