I have been using the free 2mths stadia gave away and decided to get the premier edition. I was seeing posts on here that people were not being able to use those codes sent when you purchase stadia premier edition because they already had an account. well i just inquired about this in a chat because my free ends today. and i was told yes it true the codes are not good with existing accounts just new ones. but you can use another gmail account to use the codes sent. happy days get at getting a new gmail account and game on. gl all