Prior to the group photo gathering, Saudi Crown Prince chatted with President Trump and his daughter Ivanka, ahead of the start of the two-day meeting of the world's top economies, according to AFP.
Macron's demand came shortly before Theresa May held face-to-face talks with the crown prince in which she promised to send a "robust" message about the murder, as well as the war in Yemen.
While Turkey hasn't explicitly named MBS, President Recep Tayyip Erdogan said the murder was ordered at the highest level of Saudi leadership, though not by King Salman bin Abdulaziz Al Saud.
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They also discussed the investment opportunities in the infrastructure through the Public Investment Fund and replacing Saudi Arabia's agricultural imports from other countries with Indian agricultural products.
The prime minister's aides refused to say whether she would ask the crown prince if he was directly involved in the murder of Jamal Khashoggi.
Highlights include Macron's faux-exasperated "You never listen" ("I will listen, of course" allegedly replies a slightly sheepish MbS) and the crown prince vowing that he is a "man of his word".
US intelligence agencies have concluded the crown prince ordered Khashoggi's killing.
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"You never listen to me", lamented Macron as the Saudi Prince laughed-off the confrontation. He told reporters he "exchanged pleasantries" with the Saudi leader but nothing more, adding that a meeting "might" happen, per CNN's Jeff Zeleny.
Trump said he "had no discussion" with the crown prince, but "we might", the official said. Later Friday, a White House official said Trump and Prince Mohammed exchanged pleasantries at a leaders' session - as the president did with almost every leader in attendance.
MBS is expected to meet with just a few leaders at the summit in Buenos Aires, including Putin.
In fact, Trump even cancelled a formal sit-down with Putin over Moscow's seizure of Ukrainian vessels.
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Separately, the arrival of German Chancellor Angela Merkel was delayed after her official jet was hit by technical issues, forcing it to return to the country shortly after take-off.