Did Solomon disobey God while he was king?

Take a look at Numbers 20:2-13.

God gives the Israelites water from a rock, but Moses does not make it look like God did it. Moses disobediently puts on a show (striking the rock, which was not what God specified), and makes it look like himself who is bringing the water.

God says, "Because you did not believe in Me, to sanctify Me in the eyes of the Israelites, therefore you shall not bring this assembly into the land which I have given them."

Moses didn't lead the people to trust in God, so he is unfit to lead them into the Promised Land, which will require great amounts of trust.