Pauper EDH - Legality of commanders printed at 2 rarities

{"ops":[{"insert":"Hello! \n\nI'm coming across something within pauper commander that I'm not finding a clear answer on. When selecting a commander on archidekt that's been printed at both common and uncommon (slippery bogle) I'm receiving an error that it's not a legal commander. However in looking at other sites, common decklists, tournament reports, etc. I see that Slippery Bogle has been used. \n\nDoes anyone know if archidekt is correct on this? I read the official rules for the format and all it says is that a card printed at both rarities is legal for use within the deck, but nothing specific about the commander. \n\nThanks! \n"}]}