Question about Spotify Premium voucher 12 months for the price of 10 months

Is only for one person.

Hello, you can only listen to one device at a time. But the account can be installed on several devices. I hope my explanation is clear to you?

The voucher is only valid for one person. It can be used to take out a plan for one person for one year.
However, you only pay for 10 out of 12 months.

Spotify Premium can be installed on multiple devices and therefore also for multiple users. However, you cannot run the application on different devices at the same time in either the free or the paid standard version.