iamRoleArn

This parameter is required if Destination is Evidently. If Destination is CloudWatch, don't use this parameter.

This parameter specifies the ARN of an IAM role that RUM will assume to write to the Evidently experiment that you are sending metrics to. This role must have permission to write to that experiment.

If you specify this parameter, you must be signed on to a role that has PassRole permissions attached to it, to allow the role to be passed. The CloudWatchAmazonCloudWatchRUMFullAccess policy doesn't include PassRole permissions.