Hi @luckxmax,
It means you already have a city linked to this account. You need a second account to save a new city.
You'll find more information below:
Can I delete my city and start over?
Sorry Mayor, your city is for keeps! Try rearranging your buildings or re-drawing your roads if you need a change, and remember you could get some of your Simoleons back for bulldozing purchased buildings!
Can I delete my saved cities from Facebook, Game Center or Google Play?
There's no way to delete those previous saves, sorry! It's a security feature to make sure you can play across your devices safely.
Can I save two cities using the same Facebook, Game Center or Google Play account?
No but you can create a new account if you would rather save your new city than rearranging the old one.
How do I access my city from a different device?
First, make sure you've saved your city online! Then complete the game tutorial on your new device. The option to connect online will appear. Log on to the account where your city is stored and it will automatically load up on your device.
I can't sign in, the connection options are missing!
Complete the tutorial, then the connection options will magically appear in your game settings.
Hope that helps.
