Microsoft found that Chinese and Iranian hackers have been active — but often not in the way President Trump and his aides have suggested. Federal officials insisted that the Microsoft report was consistent with their own warnings, which named Russia, China and Iran as three nations seeking to gather information from the campaigns. But the most recent assessment by the director of national intelligence, last month, also said China preferred that former Vice President Joseph R. Biden Jr. win the 2020 election. The Biden campaign said that it was “aware of reports from Microsoft that a foreign actor has made unsuccessful attempts to access the noncampaign email accounts of individuals affiliated with the campaign” and that it is preparing for the inevitable onslaught of attacks in the coming weeks. The findings come one day after a government whistle-blower claimed that officials at the White House and the Department of Homeland Security suppressed intelligence concerning Russia’s continuing interference because it “made the president look bad” The report is far more detailed than any yet made public by American intelligence agencies.