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from page 77 of the report ( pdf page 113 )

"McCabe's notes from a morning meeting with Corney and others in late July 2016 reflect that McCabe learned from Corney during the meeting that another U.S. government agency had briefed President Obama on intelligence that agency had suggesting that a RIS was engaged in covert actions to influence the U.S. presidential election in favor of Trump. McCabe told us he did not attend this White House briefing; however, based on his notes, he said he did not believe the FFG information would have been discussed during this meeting, and our review of his notes did not indicate otherwise. According to McCabe's notes of what he had been told by Corney, President Obama stated that the FBI should think about doing "defensive briefs."

Comey meeting late July 2016 - a presumption that is was before Crossfire Hurricane was started (07/31/2016)
Another U.S. Govt. agency had briefed the president... - this had to be earlier than Comey's meeting with McCabe...when? Who knows.
In Horowitz's 06/2018 Report, the earliest I can see maybe a related date is 07/05/2016.

Pres. Obama...FBI should think about doing "defensive briefs" - which is ultimately what they did.

There isn't much in this document about Pres. Obama - 15 or so mentions and many of those are repeated.