Hello - I wanted to revisit this topic because it is happening to me as the OP described. I click the order button and it tells me that Email and Password don't match. Subsequent clicks of "Checkout" produce no action and no message. I have had this happen in the past and logged out of the app and back in. Which forces you to reconfigure like it's the first time you've used it.
When I do that, it lets me log in, shows me my product and lets me update them. But when trying to order EGSS Stansted it will not let me. "Email and Password do not match"
I'd like to figure out what's going on