What does Isaiah 22:15 mean?

The Lord, the Eternal One, the Commander, said, 'Go to that palace manager, Shebna, the one in charge of the royal household, and give him this message.' Isaiah 22:15 - Modern Text Bible

(God sends Isaiah to confront Shebna, a high official who manages the king’s house. This is a direct call-out to someone abusing their position.)