A point of error appears to say that you do not find yourself in an eligible region to install Spotify or other skill you want?
Follows the following steps:
Change your Amazon account to another region:
Aced Amazon.com:
Click on the menu: Your Account: Account> Digital Content and Devices> Devices and Content.
Click on preferences: (to have access to skills in another region)
In Settings - Devices/Region: Change your address to a address in another region, where Skill is available, eg. Brazil. Click on updating.
Now just go to the application of Amazon Alexa, finish the session and start starting.
This process works for any skill that is not yet available to our country, and is already in others.
Once the intended skills are installed (Spotify and others), you can repeat the process again and change your address to Portugal. The already installed skill will remain intact.
To install a skill: (in this case, Spotify)
Enters the Amazon Alexa Application; In the lower bar, click more> skills and games> search for Spotify> enable to use.
Buy your Amazon Alexa