Copy all secrets from one Azure Keyvault to another Key Vault using Powershell

$NewKeyVaultName="<your new key Vault>"

$ExistingKeyVault="<your existing key Valut>"

$secretNames = (Get-AzKeyVaultSecret -VaultName $ExistingKeyVault).Name

$secretNames.foreach{

    Set-AzKeyVaultSecret -VaultName $NewKeyVaultName -Name $_  -SecretValue (Get-AzKeyVaultSecret -VaultName $ExistingKeyVault -Name $_).SecretValue

}