The German Embassy in Armenia recommends applying for a long-term visa through the Auslandsportal platform

ArmInfo. Apply for a visa to  Germany on the Auslandsportal platform: online, easy and secure, the  German Embassy in Armenia states on its Facebook account.  "Complete  your application online and have it checked in advance by the German  Embassy in Yerevan to ensure it is complete. In this way, you will be  prepared for the fast-track-in for the interview at the embassy,  where you can provide your biometric data (fingerprints and photo)  without the necessity of registering onto a waiting list.

During the current pilot phase, only online applications for certain  types of visas for long-term stays (so- called national visas) are  available.

Other visa types, especially the German Opportunity Card  (Chancenkarte), will be gradually added." You can contact at the  following link: https://digital.diplo.de/visa .