Notification Delivery Service - The server response was: 5.7.57 Client not authenticated to send mail

When setting up Notification Delivery (SMTP) within Snow License Manager; customers are unable to receive the email. After verifying the following log location:

C:\Program Files\Snow Software\Logs\NotificationDelivery

Errors appearing referencing 'The server response was: 5.7.57 Client not authenticated to send mail'. Please see example below:

Snow License Manager 9.x

After running the PowerShell script (as administrator) below; it was clear that the issue was in regards to authentication with the Exchange/O365 portal.

$cred = Get-Credential -UserName accounttryingtosendfrom@snowsoftware.com -Message "Enater Password for account"
 
$mailParams = @{
    smtpServer         = "smtp.office365.com"
    Port               = '587'
    UseSSL=$true
    Credential = $cred
    From = "accounttryingtosendfrom@snowsoftware.com"
    To="accounttryingtosendto@snowsoftware.com"
    Subject = "SMTP Relay"
    Body="Message SMTP Relay"
    DeliveryNotificationOption='onFailure','OnSuccess'
}
 
Send-MailMessage @mailParams

*Note: Replace the following parameters: Username (line 1), From (line 8), To (9)

After running the PowerShell script (noted above) - it was evident that the issue was related to the exchange. Please ensure:

• That the details are correct within SMACC > Snow License Manager > System Core Settings > SMTP_*:

• Verify with your Exchange administrator the correct SMTP port.
• Verify with your Exchange administrator if you are using SSL or TLS for connectivity.
• Re-run the Powershell script above; if successful - then the issue should then be resolved.

The account did not have the correct authentication to send emails.