Getting a 403 Forbidden when invoking an AWS Lambda from a Genesys Cloud Architect Data Action. I’ve set up the IAM role with basic Lambda invoke permissions, but the call fails immediately. The JSON payload looks fine. Here’s the request config:
{
"uri": "arn:aws:lambda:eu-west-1:123456789:function:myFunc",
"method": "POST"
}
The Lambda logs show no invocation attempts. Is there a specific trust policy I’m missing for the Genesys Cloud service principal?
The 403 is almost certainly coming from the IAM trust policy, not the permission policy. Genesys Cloud uses specific AWS account IDs to make these calls, and if your Lambda role doesn’t explicitly trust those accounts, AWS rejects the request before it even hits your function code.
You need to update the AssumeRole policy for the IAM role attached to your Lambda. Here is the structure that works with Genesys Cloud’s AWS integration:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": [
"arn:aws:iam::833726341836:root",
"arn:aws:iam::586488163437:root"
]
},
"Action": "sts:AssumeRole",
"Condition": {}
}
]
}
The account IDs 833726341836 and 586488163437 are the standard Genesys Cloud AWS accounts for the US and EU regions respectively. If your instance is in a different region, check the Genesys Cloud documentation for the specific ID, but these two cover most cases.
Also verify that the policy attached to the role actually allows lambda:InvokeFunction for the specific function ARN. A common mistake is setting the permission on the role but forgetting to bind that role to the Lambda function in the AWS console.
Once you update the trust policy, wait a few minutes for propagation. The Lambda logs will start showing invocations. If you’re tracking this in New Relic, you can correlate the GC Data Action timestamp with the Lambda start time to spot latency spikes.