Like the OpenID Connect Authorization Endpoint setting: as not all providers will implement a complete set of API calls for OpenID Connect, this setting is provided in case your provider does not support the "/.well-known/openid-configuration" URL.
The Inventu Viewer FVTerm runtime will attempt to retrieve this setting from your provider using the above call, but it isn't supported, you may need to provide it.
Note that if both the provider is missing the openid-configuration url, and you have omitted this setting, FVTerm will use:
https://[ OpenID Connect Issuer URL for Authenticating ]/oauth/token
