How to create a self-signed certificate for Exchange Online Email Notifications (4381176)

The certificate used for the Exchange Online Settings within the Email Settings modules is expired and a new one is needed:

The steps below will create a new self-signed certificate than can be assigned to the Active Administrator server and the Azure registered application:

1. Open an elevated PowerShell prompt in the Active Administrator server
2. Execute the following commands:

# Create a new self-signed certificate in the CurrentUser store

$cert = New-SelfSignedCertificate `
  -CertStoreLocation "Cert:\CurrentUser\My" `
  -Subject "CN=MyAppCert" `
  -KeyExportPolicy Exportable `
  -KeySpec Signature `
  -NotAfter (Get-Date).AddYears(1)

# Define a password for the PFX export

$pwd = ConvertTo-SecureString -String "Password" -Force -AsPlainText

# Export the certificate with private key (.PFX) to C:\Temp

Export-PfxCertificate -Cert $cert `
  -FilePath "C:\Temp\ExchangeOnlineApp.pfx" `
  -Password $pwd

# Export the public key only (.CER) to C:\Temp

Export-Certificate -Cert $cert `
  -FilePath "C:\Temp\ExchangeOnlineApp.cer"