Azure AD extension attributes from AD Connect

EStrong9Hi - you are using the AzureAD Module, which is marked for Deprecation. If you want full access to all Information in Entra ID (new Name for Azure AD) you will want to move to the new PowerShell Modules.

You should try Get-MgUser and Update-MgUser, however I personally find that the documentation of the PowerShell SDK for the Graph API (the semi-new way to talk to Entra ID) is so poor that I prefer using Invoke-MgGraphrequest and the Graph API Documentation (https://learn.microsoft.com/en-us/graph/api/user-get?view=graph-rest-1.0&tabs=powershell). When interacting with Users it is important to know that you have to explicitly request a lot of properties, since the API only returns basic information by default.