From the context it could be that the prophet of the Lord Micaiah is being sarcastic. If that’s the case, this would be the only recorded sarcasm in the Bible.
An alternative is that he’s talking to the King of Judah and ignoring the King of Israel, Ahab, whom he then speaks to in the following verses.
This vision that Micaiah saw might not just be a vision but could also be what actually happened, the spirit being an Angel as we are told that angels are ministering spirits Hebrews 1:14.Hebrews 1:14XWaiting for response We see an example of angels working in the earth and consulting together Daniel 10:13.Daniel 10:13XWaiting for response It’s an exciting prospect when we consider that the saints will be equal to the angels, liked performing similar work Luke 20:36.Luke 20:36XWaiting for response
Verses 5-6
1 Kings 22:5-6XWaiting for responseUnderstanding that the original words for Lord are different in these two verses, helps to understand what is being said. The Lord in verse 5 is God and the lord in verse 6 is any lord.