Warframe acc link to steam not possilbe for some reason :S

[Troy Bolton]

Hi!

When i start Warframe over steam and try to log me in, I get a massage that my warframe is not compatibel to steam, I have to play it over the non-steam version. In the internet I found some threads, which said that i have to link my warframe account to my steam. So, ive gone to the warframe website and clicked on "Account management" but there was NO button to link my acc to steam. Does anyone know why it isn't there?