The proportion of adults (aged 25-64) who have not completed upper secondary education is higher among adults born outside the country of residence …

„On average, across the EU Member States, the proportion of adults (aged 25-64) who have not completed upper secondary education is higher among adults born outside the country of residence (foreign born) than among adults born in the country (34.1 % compared with 19.6 % in 2019).“
EU-Kommission (Hrsg.), Adult education and training in Europe (2021), S. 32.
In Österreich verfügten im Jahr 2019 nur 11,0 % der im Inland geborenen 25- bis 64-Jährigen über keinen erfolgreichen Abschluss der Sekundarstufe II, aber 25,3 % der im Ausland geborenen. (Quelle ibidem.)