Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
This video goes through the steps of setting up Platform Analytics from installing the Strategy Intelligent Enterprise to running your first dossier. The video goes through a Windows single machine setup but has tips and pointers if you are setting up on a different environment.
As referenced in the video, there are various KB articles that can assist, as well.
KB442094 : Platform Analytics FAQ
KB482944 : Platform Analytics Best Practices and Known Issues
KB442424 : Best Practices for Strategy Messaging Services
KB442596 : Platform Analytics Installation
KB442588 : Configuring and Troubleshooting Topology