We have been trying to purchase train tickets from Geneva Airport to Chamonix Mont Blanc (via the sbb.ch website) for travel in August 2022, but always seem to get an error message and are thus unable to purchase any tickets. Interestingly enough, when we attempt to buy tickets for travel in September 2022, the website takes us through to the purchase page with no issues at all.
Is there a problem with train tickets released for August 2022 travel?