Reference:
https://docs.microsoft.com/en-us/powerapps/maker/portals/portal-templates
https://docs.microsoft.com/en-us/dynamics365/customer-service/embed-chat-widget-portal

Scenario: Ensure that employees can sign in to all Microsoft apps by using one set of credentials per employee.
Synchronized identity. Synchronize on-premises directory objects with Microsoft 365 and manage your users on-premises. You can also synchronize passwords so that the users have the same password on-premises and in the cloud, but they will have to sign in again to use Microsoft 365.
Reference:
https://docs.microsoft.com/en-us/power-platform/admin/manage-user-account-synchronization

Business process flows provide a guide for people to get work done. They provide a streamlined user experience that leads people through the processes their organization has defined for interactions that need to be advanced to a conclusion of some kind.
Use business process flows to define a set of steps for people to follow to take them to a desired outcome.
With business processes flows available as an entity, you can now use advanced finds, views, charts, and dashboards sourced from business process flow data for a given entity, such as a lead or opportunity.
Scenario:
Agents need a solution to replace paper reservation checklists.
Agents need dashboards to show a current count of all reservations on the entity.
Agents need a way to track reservation issues.
Agents need a visual indicator in the interface to determine the reservation step to provide a seamless customer experience.

Scenario: Standardized checklists must be stored in the solution for use by inspectors. A copy must be created when a new inspection is initiated.
Dataverse for Teams - built on Microsoft Dataverse - provides relational data storage, rich data types, enterprise-grade governance, and one-click solution deployment to the Microsoft Teams app store.
Dataverse for teams table creation has all of the things that are great about Microsoft Lists, without the major downsides.
Reference:
https://docs.microsoft.com/en-us/powerapps/teams/create-table