facebook - How do you log into a 3rd party web app in a Windows Hosted Web App? -

i love using facebook's messenger.com web app don't messenger universal app windows.

so thought i'd create own hosted web app wrapper messenger.com.
the process seemed simple. , was. app opens , loads messenger.com.

but, second click login button kicks out browser window.

is possible log 3rd party service in hosted web app?