I can open Power Apps, but I can’t tell if this Dataverse environment is ready for my app

Power Apps can open and Dataverse can appear while the active environment still lacks a database, licence entitlement, System Customizer rights, or row privileges. Makers need evidence-based readiness before creating apps or tables.

This is a researched blocker from Power Apps Builders. Below is the solution path — from understanding it to a paste-ready asset.