My application is using Acquia's Federated Authentication, an Acquia Cloud Platform feature that enables you to authenticate your Acquia Cloud applications access with an external Identity Provider (IdP). I am also setting up Cloud IDE and getting an error in the Cloud IDE terminal saying "This resource requires additional authentication".
These are the steps to resolve:
Confirm that you are using acli version 1.19.0 or later. If you aren't, then run
to update to the latest version.
Next, as the on-screen help text mentions, run
to register your Cloud API key and secret to use API functionality.
At this point you should be able to run
and see your new key listed in the Cloud IDE terminal under the heading: "Cloud Platform keys with matching local keys".