The certification of documents from the country where your documents were issued is currently suspended.
The Federal Ministry of Europe, Integration and Foreign Affairs can suspended the certification of documents from specific states if it is not possible to guarantee the authenticity of the documents or the veracity of their content. In this case, the Austrian representative authority for that country is not allowed to certify documents from the country. The legal basis for this measure is Section 6 of the Consular Certification Act (in German: Konsularbeglaubigungsgesetz (KBeglG).
Submit your documents to the TU Graz Registrar's Office without certification.