It is, look on the ASRock forums to see how many people can't get it stable above 2400. I'm running Trident Z RGB 3200 @ 2400.
In which case, I would strongly recommend that you look at sending it back, as the official supported speed for Ryzen is up to 2666MHz, so as far as trade descriptions goes, it is not fit for purpose. 2666MHz is not considered an overclock, so there can't be any reason they will not take it back and swap it for a different board.
Also, I've just had a browse around the interwebs, and since 1.0.0.6 was released loads of people have now got it to go well above 2400MHz. Did you update the BIOS?
