“I don’t know but after this meeting I will find out and get back to you”
Is an acceptable answer.
Not really, in any company I've ever worked.
The answer is "accepted", in the sense that it won't get you fired. But the meeting plows on, and decisions are made in absence of the answer to the question! — and never revisited once the answer is known.
And like 90% of the time it comes up, it's because the data contradicts the decision.
True, but only for things that that your colleagues don't expect you to know already. Remember the "I'll circle back" meme about Jen Psaki? This response can only be used sparingly before it's seen as a sign of underpreparedness/inability to do back-of-the-envelope thinking.
Why would they ask you when they can ask Claude then?
It's only an acceptable answer when used sparingly. The more often it's used, the more questions arise about your role in that meeting.