It&#x27;s probably similar to how most EU countries work - you can have two citizenships,but both of those countries will only recognize their citizenship. So for example - if you had a dual Polish&#x2F;British citizenship, Poland would only recognize your Polish citizenship. As long as you are in Poland, you are a Polish citizen in the eyes of the law, and you would not be officially treated as a foreigner, or even recignized as one. You could go to the British embassy, but they would be unable to help in regards to Polish law, because Polish law would not recognize your British citizenship. The same works in reverse, if you were in Britain, only your British citizenship would be recognized. However, if you traveled to any other country, you get to pick which citizenship you want to use for official purposes.