What does it mean when the flag is not flying at the White House?

Before President Joe Biden’s inauguration, social media users shared a false claim that there was no flag flying over the White House — suggesting it was a sign that the military had taken control of the government. In fact, the flag was flying above the White House on Jan. 20, and Biden is president.

https://www.factcheck.org/2021/01/false-claim-of-no-flag-above-white-house/