Honesty can only work when it’s two-way.
You can’t be honest if you do not accept others to be honest with you as well, and you can’t demand honesty if you are not honest in the first place yourself.
It’s about building trust and knowing that the other is going to be on your side when it matters. Sometimes by putting you in front of harsh truths, sometimes by telling you well timed lies.
Saying “let’s be honest with each other” is a commitment for the long term, something you have to start building day-in and day-out, with practice and consistency.
It’s not something for a two-hours meeting.