Private/Services/Connect-SfBOnline.ps1

function Connect-SfBOnline {

    [CmdletBinding()]
    param(

        [Parameter(
            ValueFromPipeline = $true,
            Mandatory = $true,
            HelpMessage = 'Credentials in Azure AD to access Office 365.'
        )]
        [System.Management.Automation.Credential()]
        [PSCredential]$Credential
    )

    $Module = Get-Module -Name 'SkypeOnlineConnector' -ListAvailable

    if ($null -eq $Module) {

        Write-Warning -Message "Requires the module 'SkypeOnlineConnector'"
        Write-Verbose -Message 'Download from: https://www.microsoft.com/en-us/download/details.aspx?id=39366' -Verbose
        return
    }
    else {

        if ($null -ne (Get-SfBOnlineSession)) {

            Write-Verbose -Message 'Skype for Business Online PowerShell PSSession already existis.'
            Write-Verbose -Message 'Disconnect from the current session to start a new one.'
            return
        }
        try {

            Import-Module -Name 'SkypeOnlineConnector' -DisableNameChecking -ErrorAction Stop -WarningAction SilentlyContinue -Verbose:$false
        }
        catch {

            Write-Warning -Message ('Unable to Import-Module "LyncOnlineConnector" - {0}' -f $_.Exception.Message)
            return
        }

        try {

            $null = New-CsOnlineSession -Credential $Credential -ErrorAction Stop -WarningAction SilentlyContinue -Verbose:$false
        }
        catch {

            Write-Warning -Message ('Unable to create PSSession for Skype for Business Online - {0}' -f $_.Exception.Message)
            return
        }
        try {

            $null = Import-PSSession -Session (Get-SfBOnlineSession) -DisableNameChecking -AllowClobber -ErrorAction Stop -WarningAction SilentlyContinue -Verbose:$false
        }
        catch {

            Write-Warning -Message ('Unable to load PSSession for Skype for Business Online - {0}' -f $_.Exception.Message)
            return
        }
    }
}