1 Kings 22:22

“ And YHWH said to him, ‘How?' And he said, ‘I will go forth, and will be a lying spirit in the mouth of all his prophets.' And he said, ‘You will entice him, and will also prevail. Go forth, and do so.' ”

Micaiah had far too high a view of God to actually believe that YHWH needed help and guidance from a spirit of any kind. This is a folksy explanation of false prophecy based on what he saw before him. (It was king Ahab on his throne who was inviting the advice of lying spirits). What was true was that God was allowing these men to prophesy falsely. Did the people really believe that these false prophets had contact with YHWH? Well if so, let them consider that it has simply led them astray into falsehood. History is full of examples of men who outwardly ‘prayed' and ostensibly ‘sought God's will' and then openly committed glaring sins and crimes, and were continually steeped in lies. As in this case God resisted it by raising up true prophets who reveal the truth.