Recently, I transfered my blog to another owner. My credentials to login was my email address and password. I have then transfered my blog to another owner and therefore new username (email address). However it seems like I forgot one step in the process: Signing up and creating a WordPress profile for that new email address. The result: the blog has transfered but no one is able to log in since we haven't been able to create the new password associated with the new email address (probably bc the new address don't have a profile yet on WordPress).