How to fix this issue "identitymodeleventsource does not contain definition for showpii" in web api

Question

I want to fix a Personally Identifiable Information (PII) vulnerability issue found in web applications.

I have tried implementing IdentityModelEventSource.ShowPII = true; in the code. But it says identitymodeleventsource does not have a definition for showPII

please see the attached screenshot as ShowPII is does not property of identitymodeleventsource.