Check it out, Enemy chosen eldar, but loaded into the game as space marine.
He/she can't use elite and doctrines if this happens.
Asked around some ppl know this is a bug in the game, but they don't know why is it happening.
Thank you for the report I will look into this further.
I saw another player get this issue during a stream as well. In that case it was the same, chose eldar but loaded in as spacemarine.