I cannot be able to create New User with Newly created database with MySQL.

When I check Audit Log it says::

Server was unable to process request. —> String ‘supremeelectrical_admin’ is too long for user name (should be no longer than 16)
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at SolidCP.EnterpriseServer.DatabaseServerController.AddSqlUser(SqlUser item, String groupName)


It only allow me to create New User with default Account Name like ‘supremeelectrical_’ (Default)  which exceed 16 character so how can I change that Default Name?