以下是一个示例解决方案，用于检查ADFS证书是否即将到期并发送到期通知任务。

# 配置参数
$smtpServer = "smtp.example.com"
$smtpPort = 587
$smtpUsername = "your-email@example.com"
$smtpPassword = "your-email-password"
$recipient = "recipient@example.com"
$daysToExpire = 30

# 获取ADFS证书
$cert = Get-AdfsCertificate -CertificateType Token-Signing | Where-Object { $_.IsPrimary -eq $true }

# 计算证书到期日期
$expirationDate = $cert.NotAfter
$daysUntilExpiration = ($expirationDate - (Get-Date)).Days

# 如果证书即将到期，则发送到期通知任务
if ($daysUntilExpiration -lt $daysToExpire) {
    $subject = "ADFS证书即将到期通知"
    $body = "ADFS证书即将在 $daysUntilExpiration 天后到期，请及时更新证书。"
    
    # 创建邮件对象
    $smtpClient = New-Object System.Net.Mail.SmtpClient($smtpServer, $smtpPort)
    $smtpClient.EnableSsl = $true
    $smtpClient.Credentials = New-Object System.Net.NetworkCredential($smtpUsername, $smtpPassword)
    $mailMessage = New-Object System.Net.Mail.MailMessage
    $mailMessage.From = $smtpUsername
    $mailMessage.To.Add($recipient)
    $mailMessage.Subject = $subject
    $mailMessage.Body = $body
    
    # 发送邮件
    $smtpClient.Send($mailMessage)
}

请根据实际情况修改$smtpServer，$smtpPort，$smtpUsername，$smtpPassword，$recipient和$daysToExpire的值。将其保存到一个PS1文件中，并在定期的任务计划中运行该脚本，以便在ADFS证书即将到期时发送到期通知任务。