Regarding the issue where the Windows Admin center SDK cannot obtain a session

I am developing an extension using the Windows Admin Center SDK.I built the project using the solution extension method and wrote the angular code and power shell script according to the official guidance document. WAC server is deployed on local host, and when I followed the guidance document to connect the session. I found that the session was always 'undefined'. Where is the problem and how to solve it？

The code for connecting the session is as follows:

const session = this.appContextService.powerShell.createSession('Local IP');

Official guidance document: https://learn.microsoft.com/en-us/windows-server/manage/windows-admin-center/extend/guides/powershell