User access diagnostic tool in the Power Platform admin center:
Several factors influence user access in a Microsoft Dataverse environment. To help administrators with diagnosing user access to an environment and reasons for access or no access, the new "Run diagnostics" feature in the Power Platform admin center provides basic access diagnostics for individual users in the environment. The feature helps to detect potential causes to user sign-in and other issues and suggests potential mitigations.
Reference:
https://docs.microsoft.com/en-us/power-platform/admin/troubleshooting-user-needs-read-write-access-organization