I’m not sure Fixlets with Secure Parameters can be issued in a Baseline (at least not from the Console, but the REST API should be possible)?
Secure Parameters are generally entered in the Description tab of the Fixlet, and there is JavaScript behind the “Take Action” event that encrypts the values before submitting the action. In the context of a Baseline, that individual per-fixlet JavaScript is skipped.
Where would one even set the values for the parameters when using a Baseline? Did you customize something in the Baseline description to provide a value? I haven’t looked into a method like that, but maybe it’s possible?