Can't use send-mailmessage when using PSFTP Module - email

Question

I've made a Powershell script which uploads data to a NAS.
After the Upload is completed the script should send an Email message.
When the script tries to send a mailmessage I get an error saying I used an incorrect security certificate.
This error only shows up when I use the PSFTP module. When i run the sendmail code on its own it works just fine.
The FTP session itself isn't alive anymore so this shouldn't be a problem.
Can someone point me in the right direction to sort this problem out?I've made a Powershell script which uploads data to a NAS.
After the Upload is completed the script should send an Email message.
When the script tries to send a mailmessage I get an error saying I used an incorrect security certificate.
This error only shows up when I use the PSFTP module. When i run the sendmail code on its own it works just fine.
The FTP session itself isn't alive anymore so this shouldn't be a problem.
Can someone point me in the right direction to sort this problem out?
$Execution = Get-ExecutionPolicy
If($Execution -eq "RemoteSigned")
{
Write-Host "HOI" -BackgroundColor Black -ForegroundColor Green
}
Else
{
Set-ExecutionPolicy Remotesigned
}
1.Module PSFTP importing
Import-Module PSFTP
$secpasswd = ConvertTo-SecureString “Wachtwoord” -AsPlainText -Force
$mycreds = New-Object System.Management.Automation.PSCredential (“Admin”, $secpasswd)
Variables
$Session = "Alive"
$ftp = "IP"
$Credentials = "Admin"
$FtpFile = "C:\Test\Back-up.ps1"
$ftpDestination = "FTPLOCATIE"
2.Connect to FTP with module PSFTP
Set-FTPConnection -Server $ftp -Credentials $mycreds -Session $Session
( Connect to ftp)
3.TPItem for uploading to NAS
Get-ChildItem $FtpFile | Add-FTPItem -Session $Session -Path $ftpDestination -Overwrite
4.Section for mailing,variables
$secpasswd = ConvertTo-SecureString “Wachtwoord” -AsPlainText -Force
$mycredsMail = New-Object System.Management.Automation.PSCredential (“Email-address”, $secpasswd)
5. Section for mailing
$Smtp = "smtp.office365.com"
$Port = "587"
$To = "Email"
$Subject = "Back-up"
$From = "Email
6. this is where i want send the mail i use ssl
Send-MailMessage -to $To -from $From -Subject $Subject -SmtpServer $Smtp -Credential $mycredsMail -Port $Port -UseSsl