At this point in time, no, you cannot take the DET and use it as proof of English proficiency for immigration purposes. Because the test is taken from home (remotely) and entirely online, immigration offices do not see it as enough proof. They want students to take English proficiency exams in person to ensure their credentials are valid.  In the future, DET may be more accepted. Still, for now, you will need to pass the TEFOL or IELTS (or another approved exam) to immigrate to a foreign country.  This also means that taking the DET may not be enough to immigrate to a new country, even if you are accepted into a college using the Duolingo English Test. Make sure you know and understand all the immigration requirements for the country you want to study in before travelling.