I personally have seen a number of the following during my recent investigations:
(1) Austrian companies working with Iranian firms.
(2) Iranians based in Vienna who are obviously engaged in sanctioned business.
(3) Austrian companies owned by Iranian corporations, for the sole purpose of sanctions evasion.
I am rarely in favour of raising Country Rick on any EU nation without compelling evidence, but in this case, it would appear that Austria's continuing (and illegal) overt and covert business relationships with Iranian companies justifies it. We need to see some corrective action from the Austrian Government at this time. Perhaps it thinks that the EU will ignore the situation, but you can be sure that
US law enforcement agencies are paying close attention to financial transactions involving Austrian banks, where payment for goods and services ultimately benefitting Iran has been noticed.