3508372 - Blank page displays when accessing SAP Build Process Automation Lobby

You are getting blank page when login SAP Build Process Automation Lobby:

403 error can be see in the HTTPwatch trace while issue reproduced, like:
https://<subdomain>.<region>.build.cloud.sap/registry-service/featureflags
In the content for this message, you can see:
{
    "error": {
        "code": "REG_9999",
        "status": 403,
        "details": null,
        "logId": null,
        "correlationId": null,
        "message": "Permission denied for request to access endpoint via resource URI /v1/registry/featureflags. The current user had none of the required scopes: Administrator, Developer, Delegate, EndUser"
    }
}

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

• SAP Build Process Automation
• SAP Business Technology Platform

/registry-service/featureflags, Lobby, blank page, Permission denied, Permission denied for request to access endpoint via resource URI /v1/registry/featureflags. The current user had none of the required scopes: Administrator, Developer, Delegate, EndUser , KBA , BPI-PA , SAP Build Process Automation , BC-CP-CF-SEC-IAM , UAA, Authentication, Authorization, Trust Mgmnt , Problem