Fwiw, it's entirely possible that a female on testosterone will 'pass' more convincingly that the opposite situation, because testosterone is incredibly powerful. That's entirely why males rarely pass at all if they have been through puberty, because of how profoundly testosterone affects the body.
I know a TM whom I clocked straight away, because of the croaky teen boy voice, and the first double take was only confirmed when I registered their body shape, but I wouldn't be at all surprised if many of the people this TM meets don't look beyond the scruffy beard and masculine styling.
But so what? I get called 'sir' or 'mate' any number of times in a week because I'm quite masculine in personal style, as our culture defines it. It's a bit of a running joke. I've been challenged in women's toilets. I was told off by an irate old lady once as an androgynous young teen for being in the ladies, and was far too shy to say I was a female and ended up scarpering. On the few occasions it's happened as an adult, the challenger has usually apologised, on a closer look, or when I've spoken, and I'm always very clear that I don't mind being challenged at all, because I understand how important it is for women to have the confidence to speak up if they are concerned about something.
But toilets, while important, are the very least important of all the places where single sex provision matters, and I really would like to know why so many people seem to think they are the be all and end all.