Not able to Log On to BI launch pad after setting SSO for BI-BO

Hello experts,

e have currently setup SSO between BI system (NW 7.40& BO system (version 4.0)

We are able to login to http://<BO_Hostname>:<Port>/BOE/CMC with BI system credentials as per requirement.

But when we try to access http://<BO_Hostname>:<Port>/BOE/BI it shows following error :

The change we have made in BIlaunchpad.properties file is only : Change secEnterprise to secSAPR3

Is it because of 'usedauthentication.visible=false' this value.

If anyone aware of this issue, kindly help us understand the root cause.

Thanks in advance..!!