AWS IoT unable to invoke lambda function

Question

Hi all,

I am new to AWS, and was trying to setup an IoT system where a lambda function is triggered whenever messages are received. Whenever I receive the message, however, the lambda function is not invoked (although I know the message has been received and parsed correctly). Looking at the logs, I see the message ```iot.amazonaws.com is unable to perform: lambda:InvokeFunction on resource: arn:aws:lambda:eu-west-3:216554370311:function:[...]```. I have added permissions to AWS IoT as referenced [here](https://repost.aws/questions/QUkSKZmmEWSvu7aavH8uTWzg/unable-to-perform-lambda-invoke), and I am currently at a loss on what could be the cause of such behavior.

Has any of you faced this error?

Thanks

Accepted Answer

Turns out that if I launch the cli command reported [here](https://docs.aws.amazon.com/lambda/latest/dg/services-iot.html) it works, I tried setting up everything through console and for whatever reason it didn't work as expected.

AWS IoT unable to invoke lambda function

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