OpenID Connect Client Secret field must be filled

Issue

I configured an OpenID Connect Provider Connection.
When I try to login using the OpenID Connect Client Name, I get an internal server error.

In logs, a java exception is thrown:

WARN [http -nio-8080-exec-2][PortalImp1:6018] The client secret must not be null
java.lang.IllegalArgumentException: The client secret must not be null
    at com.nimbusds.oauth2.sdk.auth .PlainClientSecret.<init(PlainClientSecret.java:59) -[oauth2-oidc-sdk-8.11.jar:8.11]
    at com.nimbusds.oauth2.sdk.auth .ClientSecretBasic.<init›(ClientSecretBasic.java:74) -[oauth2-oidc-sdk-8.11.jar:8.11]
    at com.liferay.portal.security. sso.openid.connect.internal.util.OpenIdConnectTokenRequestUtil._requestOIDCTokens(OpenIdConnectTokenRequestUtil.java:115) -[bundleFile:?]
    at com.liferay.portal.security.sso.openid.connect.internal.util.OpenIdConnectTokenRequestUtil._request(OpenIdConnectTokenRequestUtil.java:75) -[bundleFile:?]

Environment

2023.Q4

Resolution

Check the field 'OpenID Connect Client Secret' has a valid non-null value in the configured OpenID Connect Provider Connection.

Additional Information

See https://www.oauth.com/oauth2-servers/client-registration/client-id-secret/