So find me some examples from Feynman’s set of biographical anecdotes where he reached out for help. I vaguely recall one in connection with a bacterial genetics project he had on the side (at Caltech). When he was very sick with cancer, he had help with the plans to get a visa to go to Tuva. His scientific history has a lot of hunkering down and solving problems on his own, starting from his high school days, but continuing through undergrad, grad school, and faculty life.
All indications are that Feynman was quite social, just that he does not seem to have engaged in team problem solving. Actually, at one point there is a reference to his making veiled fun of classmates in a math class, who wondered whether the curves in a French curve (antiquated plastic device for drawing smooth curves by hand) had some special property. Amusing, but not very nice!