Valhalla´s Messanger bugged? (Medal order Viking)

[Tarantel]

Hi there...

Valhalla´s Messanger requires you to kill 10 troops using Vikings.

It is not clear if the RACE must be "Viking" or if they mean the UNIT called "Viking"?

Either way it doesn´t seem to count! I am lvl 6 now, used the UNIT Viking ALL THE WAY since i started and all but one troop i use has the RACE Viking... got more than enough killing blows with them, still the Order says: 0/10...

What am i missing here please?

Looking at the other medal order objectives, THIS ONE should ALWAYS be the first to be triggered xD