LL.M. students, once they have completed their registration, can submit their application for the academic identity card online here: http://academicid.minedu.gov.gr
Application guide:
https://academicid.minedu.gov.gr/xrisima-egxeiridio_xrisis.html
issu.uoa.gr/guide_for_all_students/getting_ready_for_your_studies/academic_id_card/