IAM LDAP Authentication fails with error: User returned from LDAP has null uuid

Products

• CA Cloud Test Mobile
• CA Application Test

Issue/Introduction

When trying to logon with a user ID that exists in LDAP, the following error comes up: 
ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-8) Uncaught server error: org.keycloak.models.ModelException: User returned from LDAP has null uuid! Check configuration of your LDAP settings.
UUID Attribute must be unique among your LDAP records and available on all the LDAP user records. If your LDAP server really doesn't support the notion of UUID, you can use any other attribute, which is supposed to be unique among LDAP users in tree. 
For example 'uid' or 'entryDN' . Mapped UUID LDAP attribute: entryUUID, user DN: uid=uuuuu,ou=people,dc=iiiii,dc=xxxx,dc=yy

Tried the solution from:
https://knowledge.broadcom.com/external/article/129535/devtest-iam-error-orgkeycloakmodelsmodel.html

Environment

Release : 10.6

Component : CA Service Virtualization

Resolution

In the particular LDAP system with this problem, there was an employee-number that uniquely identifies the user.
After using that in the "UUID LDAP Attribute" field, the error 'User returned from LDAP has null uuid' was resolved.