Why do I get an error when trying to add an SNS trigger to my AWS Lambda function?

Question

I'm trying to setup an AWS Lambda function that gets triggered when a CloudWatch alarm sends a message to an SNS topic. I'm following along in this guide:

https://medium.com/analytics-vidhya/generate-slack-notifications-for-aws-cloudwatch-alarms-e46b68540133

I'm stuck at step 6 at the point where it says to add the trigger to the function. I select my SNS topic as the trigger but when I hit Add it gives me the following error:

An error occurred when creating the trigger: Invalid parameter: Invalid protocol type: lambda (Service: AmazonSNS; Status Code: 400; Error Code: InvalidParameter; Request ID: 343350ee-b514-5c7c-8180-08fe5fd643ec; Proxy: null)

Does anybody know what that error means and what I can do about it?

Thanks

Answer 1

I ran into this problem recently...

As of now, Lambda only supports Standard SNS topics.

You will need to change your SNS topic from FIFO to Standard.