Recently I was facing the issue when login through my domain user account I am unable to create database. SQL Server throwing error like you don’t have permission.
By mistake I don’t have “SA” username ‘s password.
I tried to search on internet at after reading few articles I found below link which resolved my issue. It assign my domain user sysadmin permission.
I hope it will help you people also.
So enjoy downloading it and running it
Thanks & Best Regards,