function Get-YeatsLambdaIamRoleArn {
<#
.SYNOPSIS
    Retrieves the environment-specific ARN for the Yeats rotation Lambda IAM role.

.PARAMETER EnvironmentTag
    [string] The 'alk:env' value for the Yeats Lambda IAM role name.

.PARAMETER ProfileName
    [string] The AWS profile to use during search operation.

.EXAMPLE
    Get-YeatsLambdaIamRoleArn -EnvironmentTag 'qashared' -ProfileName 'temp-qa'

arn:aws:iam::668894625708:role/atlantis-generated-alk-qashared-services-yeats-lambdarole
#>

    [CmdletBinding()]
    [OutputType([string])]
    param (
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [string] $EnvironmentTag,

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [string] $ProfileName
    )

    $logLead = Get-LogLeadName
    $result = $null

    Import-AWSModule

    # Build the role name.  All of this is constant except for the environment designator.
    $roleName = "atlantis-generated-alk-${EnvironmentTag}-services-yeats-lambdarole"
    Write-Verbose "$logLead : Calculated Yeats Lambda IAM role name as '$roleName'"

    try {

        $role = Get-IamRole -RoleName $roleName -ProfileName $ProfileName
        $result = $role.Arn

        Write-Verbose "$logLead : Yeats Lambda IAM role ARN = '$result'"

    } catch {

        Write-Warning "$logLead : Unable to find Yeats Lambda IAM role named '$roleName' with provided input.`nError encountered was: '$PSItem'"
    }

    return $result
}