The duke has also fought a series of legal battles over security arrangements in Britain, arguing changes made after he ceased being a working royal left his family at greater risk during visits to the UK.
Those disputes have unfolded alongside continuing reports of limited contact between Harry and William, whose relationship has shown little public sign of improving.
Against that backdrop, Harry’s latest visit attracted particular attention because it included a private meeting with Charles at Highgrove.
The gathering marked the first time the monarch had seen Archie and Lilibet in four years and was widely viewed as a symbolic step toward rebuilding family ties after years of public acrimony.
Despite Harry’s improved standing, the poll underlined the continued challenges facing the Sussexes’ public image.
Markle’s approval rating remained substantially lower than Harry’s, while William and Catherine continued to command the strongest levels of support among senior members of the Royal Family.
The survey also highlighted continuing public disapproval of scandal-mired former Prince Andrew, 66, who finished last in the rankings with a favorability rating of just 2 percent amid ongoing controversy surrounding his association with the late trafficker Jeffrey Epstein.