Summary
After upgrading Identity Governance to a newer version, accessing various areas of web UI may cause the following errors to display: Invalid feature service key [...]. This article explains the cause of that error and how to address it.

Products
Identity Governance (IG, Access Review)

Environment
Identity Governance 3.x

Situation
After upgrading Identity Governance to a newer version, accessing various areas of web UI may cause the following errors to display:
Invalid feature service key: [...]
with the service key name in square brackets, for example:

Invalid feature service key: [DashboardService]
As a result parts of the web UI are not functional.

Read Full Support Article for Cause and Resolution. 

Support Article Reference Number (URL Name)
KM000008548