Share your experience!
I did a factory reset on my Xperia and when im starting the phone i can chose Swedish and i can chose wifi and olso chose to start the phone as a new device BUT when im going to log in whit my Google account it come up a text whit the words "log in whit a account that are used on the phone earlyer" and i have only one Google account and it worked on the phone before the factory reset. Can any one help me please?? And im sorry about my English 😛. Best regards from THE Nothern Sweden.
go to "Android Device Manager" on your computer, see if you can login and find the phone
Hi @Johan8119, sorry to hear about this. 
Did you reset the password on your Google account just after/prior to the factory reset? If you have, there is a 24 hour lockout period before you can use the same account to verify your identity towards Google Device Protection.
Let us know if you have been able to login again or I'll assist you further!