I follow the steps in Ax installation guide on how to install reporting service for Ax.
When I came on setting up application pool, I got this error
The identity of application pool 'AxReportServer' is invalid, so the World Wide Web Publishing Service can not create a worker process to serve the application pool. Therefore, the application pool has been disabled.This is corrected by assigning Ax proxy account to local IIS_WPG user group.
Later I need to assign ax proxy account to ReportServer and ReportServerTempdb database.