Fails with proxy user not supported even when security.kerberos.fetch.delegation-token is set to false

security.kerberos.fetch.delegation-token: false

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/export/home/vsowrira/flink-1.18-SNAPSHOT/lib/log4j-slf4j-impl-2.17.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/export/apps/hadoop/hadoop-bin_2100503/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
org.apache.flink.runtime.security.modules.SecurityModule$SecurityInstallException: Unable to set the Hadoop login user
	at org.apache.flink.runtime.security.modules.HadoopModule.install(HadoopModule.java:106)
	at org.apache.flink.runtime.security.SecurityUtils.installModules(SecurityUtils.java:76)
	at org.apache.flink.runtime.security.SecurityUtils.install(SecurityUtils.java:57)
	at org.apache.flink.client.cli.CliFrontend.mainInternal(CliFrontend.java:1188)
	at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1157)
Caused by: java.lang.UnsupportedOperationException: Proxy user is not supported
	at org.apache.flink.runtime.security.token.hadoop.KerberosLoginProvider.throwProxyUserNotSupported(KerberosLoginProvider.java:137)
	at org.apache.flink.runtime.security.token.hadoop.KerberosLoginProvider.isLoginPossible(KerberosLoginProvider.java:81)
	at org.apache.flink.runtime.security.modules.HadoopModule.install(HadoopModule.java:73)
	... 4 more