Free packages cannot use flexible mode

Hi, I am getting an error I was not getting last week when trying to use the Routing API: ‘Free packages cannot use flexible mode’. I want to get alternative routes between 2 points so I unlocked certain flexible features by setting ch.disable=true. Is there something I am missing? Many thanks for your help.

When you sign up you get a 2 weeks trial for the standard package, without the limitations the free package has.