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here’s what i’ve used successfully
```				LambdaFunctionAssociations: cloudfront.DistributionDefaultCacheBehaviorLambdaFunctionAssociationArray{
					&amp;cloudfront.DistributionDefaultCacheBehaviorLambdaFunctionAssociationArgs{
						EventType: pulumi.String("viewer-request"),
						LambdaArn: pulumi.Sprintf("%s:%s", lambdaFunc.Arn, lambdaFunc.Version),
					},
				},```

That's basically what I tried but with pulumi.concat, the problem is my function has no versions so the version ends up being `:$LATEST` which cloudfront doesn't accept. I am now trying with `publish: true`

that seemed to do it, I will need to retry with an empty stack since I only did an update