Buy Xbox Gamepass for Pc at Instant gaming?

There's an offer where you can get the game pass for 2 euro for 14 days. But it also says that it only applies to new accounts. What do you mean by that exactly? Is it only for accounts that have never had the gamepass?

Here is the offer

https://www.instant-gaming.com/de/5716-kaufen-xbox-game-pass-ultimate-14-day-trial-only-new-accounts/

This is a key for a trial subscription. Such a code can only be redeemed once, after which no further trial subscriptions are possible.

So if you've had one before, the key won't work.

Ok thanks, never had one, will probably buy it for me