Splunk! Could not find newly deployed instances

In our company we have a few different types of environments. Splunk is working fine on cloud environments or shared environments, as long as harness is the one that actually deploys the application.

We also have IaaS virtual machines where we deploy from harness using managed salt master platform.

I want to run Splunk tests after deploying those applications, or just in empty test workflow without deploying anything at all. Why do I get stuck with “Data collection failed: Could not find newly deployed instances”? It makes no sense. I should be able to connect to splunk for any reason I want.