Like Exchange Online, Skype for Business has its own module that uses remote PowerShell sessions. Similarly, you will be prompted if you don't provide a value for $Credentials. You might also need to specify the UserPrincipalName that corresponds to the credentials you provide—although it's not 100% clear exactly why this is necessary.
Connecting is fairly straightforward, as the example here shows:
Write-Host -ForegroundColor Cyan "Connect to Skype for Business Online"$global:S4bSession = New-CsOnlineSession -Verbose <# :$VerbosePreference #>-Credential $CredentialsImport-PSSession $global:S4bSession -Verbose <# :$VerbosePreference | Out-Null #>
With Skype for Business, things get a bit complicated if you're ...
