Admitting your fallibility or ignorance is one of the ways to Share vulnerability and to ‣, and ‣, and to increase your Trustworthiness.
‣ Follow "I don't know" with "But I'll find out."
https://janav.files.wordpress.com/2018/07/my-mind-wanderings-on-learning-and-thinking.pdf What kills learning? Your ego. To your ego add a big title. In a corporate environment where you are expected to know everything. This is dangerous. You need to avoid ego at all cost and be very comfortable to say "I don’t know."
‣ Admission of ignorance is often the first step of our education. How we can recall our ignorance, which our growth requires, if we use our knowledge all of the time?