Meghan Markle and Prince Harry are being put over a barrel at Netflix -- 'cause they're apparently on the verge of losing millions unless they pivot ... so says a new report. According to The Sun, Netflix honchos have recently had a convo with the ex-Royal couple ... supposedly telling them to make better, must-see content -- or risk not getting the rest of their $100-million-plus contract ... which they've already gotten about half of at this point.