Even if the OS is the same and the browser is "the same" there are a number of security options that can block sites, and the odds are the two devices are set up differently. You'd have to step through every setup preference in both, side by side, to compare and see.
It is NOT UNUSUAL for web sites to simply "not work" these days, even in the top browsers. Too many web site designers have gotten bit by the "pretty pretty shiny shiny" bug and they wind
up using options that just aren't universally supported. Or secure.