Jun 26, 2017 - 4:52 AM
in reply to prachi82
Hi prachi, and welcome to MySwissAlps!
Yes, technically it renders your pass invalid. Conductors do not always ask to see your passport, but if they do, and the number does not match, you might be fined (each time) for travelling without a valid pass, as well as being charged the full fare for the journey.
I would advise you to contact the company from which you bought the pass and ask for it to be re-issued with the correct number. There will probably be a fee.