Do vouchers from abroad also work in Germany?

If I e.g. Get me an Xbox One voucher from Bulgaria, will it work in Germany?

I once bought a Google Playstore voucher card in the USA and I couldn't even redeem it in my account. Find out about the redemption conditions or do without the voucher altogether.

Okay, thank you for the answer.

No usually not.

It depends on the voucher. Some are only valid nationally, some Europe-wide and some others worldwide…