This only works when you trust your team members. This means absolutely nobody who can fire me on the spot, not my supervisor, not my skip, not the CEO/CTO/VP should be on the call. No non-technical staff from the above list should have a right to challenge estimates. No product owner can belong to the above list. There should be openness when technical decisions made by a team get overriden from people on the above list. Especially when something painful like a terse edict to the effect of "allow x and y from security and audit team full, direct, read-write-execute permission to the backing data store of your micro service in production".
If there is no communication from the top, or there are negative consequences for speaking up, expect people to mentally check out.