Did he meet with with the FBI without legal counsel present? The answer is yes.
https://www.washingtontimes.com/news/2020/may/7/framing-of-michael-flynn-the-story-that-should-hav/
Framing of Michael Flynn: The story that should have won a Pulitzer Prize, but hasn’t been written
He was framed.
Evidence now confirms that Mr. Flynn was framed by crooked cops at the top of the FBI in a concerted effort to “get” Mr. Trump. As it turns out, the only thing Mr. Flynn did was work on Mr. Trump’s winning campaign in 2016. For that, the FBI and the office of special counsel Robert Mueller sought to destroy his life for more than three years for something they knew wasn’t true. We now know it took the notorious and disgraced former FBI agent Peter Strzok to re-kindle the Flynn probe in 2017 when the FBI investigation was about to be closed.