Enabling AD Authentication Method for Operations Support Portal in 1IM 8.1.2

Hi All , 

We are currently using Employee Based Authentication method for Ops portal and it works fine . But we want to use  Active Directory User Account(manual ) authentication method instead  and we are getting below errors while logging in :

1) Error 1019002

2) Login Permission Error

We have enabled Active Directory Authentication method for OperationsSupportWebPortal from designer , but the error still exists . 

Can anyone suggest if we are missing any step for enabling AD Authentication or only Employee Based Authentication works with Ops support portal ?

Thanks in advance .

Somee