Click Devices > Identity Servers > Edit > Auditing and Logging.
Select Enabled under File Logging.
In the Component File Logger Levels section, specify any one of the following options for OAuth and OpenID Connect:
Off: Turns off component file logging
Severe: Logs serious failures that can stop system processing
Warning: Logs potential failures that have minimal impact on execution.
Info: Logs informational events.
Verbose: Logs static configuration information
The system logs any configuration errors under one of the primary three levels: Severe, Warning, and Info.
Debug: Logs events for all of the preceding levels (Severe, Warning, Info, and Verbose)
Click OK.