Opted-Out-User and How to Fix
Recently geocaching.com was required to make some additional privacy changes to their platform and the API used by authorized developers. This included an option to prevent sharing information with authorized developer applications. Cachly is an authorized developer application, so this option must be disabled (box not checked) to use Cachly. You can change your setting if needed using the link below.
https://www.geocaching.com/account/settings/authorizations#developer