To use the Operata hosted CCP using the link in the Deployment section of the platform, https://softphone.operata.io needs to be allowed to integrate with your Amazon Connect instance.
It's a simple change to make, and the Operata service won't work without it.
From the Amazon Console:
Select 'Application Integration'
Then '+ Add Origin'
Add https://softphone.operata.io as an 'Origin URL'
Select the 'Add' button to save and you are all set!