I see JSON parser failed when I am trying to refresh the sites (clicked on the Refresh Acquia Cloud Sites) on Acquia Dev Desktop.
Check if your application name or organisation name is has an apostrophe (') or any special characters. For example:
If so, then change your Application name or Organisation name by removing those characters. After updating the name, Refresh the Acquia Cloud Sites on Dev Desktop. JSON parser failed issue should be resolved.
In case of any questions, please contact Acquia Support via a support ticket.