Where can I see how TurboTax calculates my RMD? It disagrees with Vanguard, produces a "we calculate a penalty of $XXX based on the amount not distributed..." message.

Vanguard calculates my RMD every year and distributes the full amount on a schedule, but this year TurboTax calculates that I owe a penalty since it thinks I did not take my full distribution. I can't diagnose the issue because I can't see how or where TT calculates my RMD. Thanks!!