The functionality to make it possible to change the name of an O365 tenant, especially with Sharepoint Online in mind, is being planned. There is no ETA at this time though.
An error occurred while saving the commentMartin commented
My tenant name is wrong because the name I really wanted was taken by our trial subscription. And back then it wasn't possible to delete the trial and it wasn't possible to downgrade the trial and make it our paid subscription. We really need to get our default tenant name changed - please...Martin supported this idea ·