The help command says, that /dkp bid is for officers only, which it isn't.
https://github.com/Roeshambo/MonolithDKP/blob/master/Localization/Localization.en.lua#L418

Corrected in newest beta. This is not compatible with 2.0.0 or 2.0.1. Recommended to wait for release once the bugs are worked out if you are on one of those 2 versions.