Get-AzureADAuditSignInLogs - cannot find object "User Agent"

Hello all,

In O365 admin center, when I went to display "Exchange Active Sync" in Azure Sign-in logs, I was able to find a useful field called "User Agent" (in Basic info tab) like below.

However, when I used Powershell cmdlet Get-AzureADAuditSignInLogs to dump the log out, there is no such field.
There is only a DeviceDetail field like below.

Can someone please verify for me?

DeviceDetail                     : class SignInAuditLogObjectDeviceDetail {  
                                     DeviceId: daa00f9d-12e7-4684-a8b8-25bced93a663  
                                     DisplayName: Mick’s phone  
                                     OperatingSystem: Ios  
                                     Browser: Mobile Safari  
                                     IsCompliant: True  
                                     IsManaged: True  
                                     TrustType: Azure AD registered  
                                   }