Well first off, we are talking about
Ahab. It was about time God took care of him. (first thought, how longsuffering God is in allowing us to reject Him, while still offering us forgiveness if we only would repent)
Ahab had been going on in his sins for quite sometime. God had had enough (turned him over to a "reprobate mind"?). It was time for Ahab to face the consequences of his sin. Notice in the previous chapter Ahab knew very well who the true servant/prophet of God was and didn't want to consult him.
That guy never has anything good to say about me! This makes me believe that Ahab knew deep down that attacking Ramoth Gilead was a bad idea. But all his 'prophets' were telling him what he wanted to hear.
Notice, Micaiah also tells Ahab what he wants to hear.

Ahab tells him to get real and spit out what God had to say, but even though Ahab
knew
Micaiah was telling him the truth, he didn't want to listen and called out God's man by saying sarcastically:
See, I told you he never has anything good to say. Thus Ahab rejected what turned out to be his last chance to accept God's ways. And he did so willfully.
Now we get to your scriptures. Ahab has made his decision, now it's up to God to decide what to do about it. Notice God's mind is already made up. "Who will go entice Ahab?" He knew what Ahab would say and yet He still had Micaiah deliever the last chance. I don't believe God is asking for advice. I believe He already has his plans made for Ahab. Yet He wants to give Ahab one very last chance (yes, Ahab just had a last chance, now he's getting another. Didn't your mother always give you "one more chance"). So He has Micaiah tell Ahab about the vision. Ahab not only rejects God, but tosses innocent Micaiah under the jail with nothing but bread and water.
God asking for volunteers is not the same as asking for their advice. He sometimes asks us what we would do and then says "good idea, go do it". This is how I see the posted verses. Now is allowing the 'spirit' to put a lying tongue into Ahab 'prophets' an example of God condoning sin, ordering sin or somehow sinning Himself? I can't see that it is.
Ahab 'prophets' were well practiced in telling him what he wanted to hear even if that meant lying to him. They were going to advise Ahab to do what he wanted. Ahab already wanted to attack. God also wanted Ahab to attack. Everyone is in agreement and on top of that the Most Holy God even made sure that Ahab knew exactly what would happen to him if he did attack! So is there really a lie if the truth is given? Not in my opinion.