The user cannot submit a print job via YSoft SafeQ FlexiSpooler

If you see the following message in the spooler.log

EXCEPTION: System.ArgumentException: No defined value for [DOMAIN_USERNAME_FROM_CLIENT] in enum [Configuration.AuthenticationType]

The authentication type of DOMAIN_USERNAME_FROM_CLIENT is used and this configuration is not valid for YSoft SafeQ FlexiSpooler or YSoft SafeQ Client V3 prior to 6.0.80. Please use the authentication type DOMAIN_USERNAME, or set DOMAIN_USERNAME_FROM_CLIENT locally in the Client config for newly deployed clients.