The Bentley Identity Management Service (or Bentley IMS for short) is the web service (https://ims.bentley.com/) that manages Bentley profiles (also referred to as Bentley IMS accounts) that exist for the users in your organization, and also verifies the user's credentials when they sign in to Bentley through the local CONNECTION Client or the CONNECT Center
Benefits of IMS include:
Administrators are able to manage entitlements to Bentley software and services to their organization and suppliers (where applicable).
A single password for users to access all Bentley products (including Bentley Communities!)
Federation for organizations (more info here)
A simplified experience for end users in accessing their projects
Move between Bentley products like SYNCHRO Control, Perform and ProjectWise with ease
Ensure seamless connection points between your projects on Bentley products
Ease of management for organization administrators to manage usage, observe trends of usage, and understand any support requests outstanding
Further information:
Licensing, Cloud and Web Services - Bentley Communities
User Management - Individual Profile
Subscriptions Analytics - Look at all your usage across products