Embedded apache drill - unable to start with security configuration - security

Question

We are fetching password with custom authentication provider and that will fetch the password from secured service. with below configuration when we start it, it is throwing error. The same configuration is working for cluster mode.
drill.exec: {
sys.store.provider.local.path="/home/user/somedatafolder",
security.user.auth:
{ enabled: true, packages += "com.app", impl: "myCustomAuthenticatorType" // custom auth provider }
},
// below properties are used by the custom authenticator to fetch the password from external service
drill.username: "username",
drill.password.key: "passkey",
drill.password.service.url: "https://somehost/api",
drill.exec.options:
{ security.admin.users: "username" }
Error :
Error: Failure in connecting to Drill: org.apache.drill.exec.rpc.NonTransientRpcException: javax.security.sasl.SaslException: Server requires authentication using [PLAIN]. Insufficient credentials?. [Details: Encryption: disabled , MaxWrappedSize: 65536 , WrapSizeLimit: 0]. (state=,code=0)
java.sql.SQLNonTransientConnectionException: Failure in connecting to Drill: org.apache.drill.exec.rpc.NonTransientRpcException: javax.security.sasl.SaslException: Server requires authentication using [PLAIN]. Insufficient credentials?. [Details: Encryption: disabled , MaxWrappedSize: 65536 , WrapSizeLimit: 0].
at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:178)
at org.apache.drill.jdbc.impl.DrillJdbc41Factory.newDrillConnection(DrillJdbc41Factory.java:67)
at org.apache.drill.jdbc.impl.DrillFactory.newConnection(DrillFactory.java:67)
at org.apache.calcite.avatica.UnregisteredDriver.connect(UnregisteredDriver.java:138)
at org.apache.drill.jdbc.Driver.connect(Driver.java:75)
at sqlline.DatabaseConnection.connect(DatabaseConnection.java:135)
at sqlline.DatabaseConnection.getConnection(DatabaseConnection.java:192)
at sqlline.Commands.connect(Commands.java:1364)
at sqlline.Commands.connect(Commands.java:1244)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sqlline.ReflectiveCommandHandler.execute(ReflectiveCommandHandler.java:38)
at sqlline.SqlLine.dispatch(SqlLine.java:730)
at sqlline.SqlLine.initArgs(SqlLine.java:410)
at sqlline.SqlLine.begin(SqlLine.java:515)
at sqlline.SqlLine.start(SqlLine.java:267)
at sqlline.SqlLine.main(SqlLine.java:206)
Caused by: org.apache.drill.exec.rpc.NonTransientRpcException: javax.security.sasl.SaslException: Server requires authentication using [PLAIN]. Insufficient credentials?. [Details: Encryption: disabled , MaxWrappedSize: 65536 , WrapSizeLimit: 0].
at org.apache.drill.exec.rpc.user.UserClient.connect(UserClient.java:207)
at org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:458)
at org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:402)
at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:169)
... 18 more