report on (someone or something)
1. To prepare or present a news report about a particular person, thing, or topic. When reporting on mental health issues, it is extremely important not to write or speak in a way that might offend or stigmatize someone. I've been assigned to report on the new prime minister.
2. To give an official or formal account of someone or something They hired me to secretly report on the CEO as a part of their internal investigation. Janet is going to report on our financial results for the last quarter.
report (up)on someone or something
to present an explanation on someone or something. (Upon is formal and less commonly used than on.) The detective visited Mrs. Jones to report upon Mr. Jones. I want to report on the events of the day. Do you have time to listen?