Ok, someone created an account for you on their Office 365 tenant for testing, and gave it no licenses what so ever. Yet, they did grant you permissions to access SharePoint Online. So, how do you find out what the SharePoint domain is? Because you have no apps in the app launcher or search box to help you out.
We mulled this over at our Puzzlepart dev chat channel, and Ole Kristian came up with the first solution:
Once logged into office.com, crank open dev tools in your browser and type:
navBarData.SPO_RootSiteUrl
This will yield the sharepoint domain name :)
Do you know a different way?