CASTM5023E Signon password error: user ID user-identifier, group security-group at LU logical-unit

A user tried to signon using TM with ID user-identifier, specifying secruity group security-group from logical unit logical-unit. The signon was rejected as a password error.
System Action:
The user signon is rejected.
Resolution:
Present valid credentials.
Module:
castmc
Destination:
Console