Is that buffered ECC or unbuffured ECC? Because last time I checked, my AM3 board had support only for unbuffured, which is really hard to find and I just didn't bother.
I don't know why you're being downvoted, your comment is accurate. Consumer hardware traditionally does not support registered memory, which is (reg ECC) the standard for server hardware hence cheap, while unbuf, unreg ECC is rather rare. AM4/Zen is no exception, no DDR4R for consumers.