Get-MgUser -UserId <id> -Property MailboxSettings returns STOP error if no mailbox

[secretworkpersona]

Describe the bug

In our automation and unattended scripts, we sometimes retrieve mailbox settings. Using Get-MgUser with the property MailboxSettings returns a STOP error if no mailbox exists. This mimics the behavior of Get-MgUserMailboxSetting.

writeErrorStream      : True
Exception             : System.Exception: [MailboxNotEnabledForRESTAPI] : The mailbox is either inactive,
                        soft-deleted, or is hosted on-premise.
TargetObject          : { UserId = xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, Property = System.String[], ExpandProperty =
                        , Headers =  }
CategoryInfo          : InvalidOperation: ({ UserId = xxxx... , Headers =  }:<>f__AnonymousType15`4) [Get-MgUser_Get],
                        Exception
FullyQualifiedErrorId : MailboxNotEnabledForRESTAPI,Microsoft.Graph.PowerShell.Cmdlets.GetMgUser_Get
ErrorDetails          : The mailbox is either inactive, soft-deleted, or is hosted on-premise.

                        Status: 404 (NotFound)
                        ErrorCode: MailboxNotEnabledForRESTAPI
                        Date: 2026-02-13T00:00:00

                        Headers:
                        Transfer-Encoding             : chunked
                        Vary                          : Accept-Encoding
                        Strict-Transport-Security     : max-age=31536000
                        request-id                    : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
                        client-request-id             : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
                        x-ms-ags-diagnostic           : {"ServerInfo":{"DataCenter":"xxxx
                        xx","Slice":"E","Ring":"4","ScaleUnit":"006","RoleInstance":"xxxxxxxxxxxxxxx"}}
                        Cache-Control                 : private
                        Date                          : Fri, 13 Feb 2026 00:00:00 GMT


InvocationInfo        : System.Management.Automation.InvocationInfo
ScriptStackTrace      : at Get-MgUser<Process>, C:\Users\xxxxxxxxxxxxxxxx\xxxxxxxxxxxxxxxxxxxxxxxx\Documents\WindowsPow
                        erShell\Modules\Microsoft.Graph.Users\2.35.1\exports\ProxyCmdletDefinitions.ps1: line 24736
                        at <ScriptBlock>, <No file>: line 1
PipelineIterationInfo : {0, 1}
PSMessageDetails      :

Expected behavior

Instead of a STOP error, I prefer Get-MgUser return a null for MailboxSettings if no mailbox exists, similar to the Manager property. Doing this removes the need for a separate call to Get-MgUserMailboxSetting or more complicated error handling (separate try/catch statements for retrieval and processing).

How to reproduce

For an account with no mailbox:

Get-MgUser -UserId <id> -Property MailboxSettings

SDK Version

2.35.1

Latest version known to work for scenario above?

Unknown if previously behaved differently

Known Workarounds

Call both Get-MgUser (without MailboxSettings) and Get-MgUserMailboxSetting.

Debug output

Click to expand log

```

DEBUG: [CmdletBeginProcessing]: - Get-MgUser begin processing with parameterSet 'Get'.

DEBUG: [Authentication]: - AuthType: 'AppOnly', TokenCredentialType: 'ClientCertificate', ContextScope: 'Process',
AppName: 'Messaging Team PowerShell Permissions'.
DEBUG: [Authentication]: - Scopes: [Place.Read.All, UserAuthenticationMethod.Read.All, Mail.ReadWrite,
User.RevokeSessions.All, User-Mail.ReadWrite.All, User.ReadWrite.All, UserAuthenticationMethod.ReadWrite.All,
Directory.ReadWrite.All, AuditLogsQuery.Read.All, PeopleSettings.ReadWrite.All, Group.ReadWrite.All,
User.EnableDisableAccount.All, Directory.Read.All, MailboxFolder.ReadWrite.All, User-PasswordProfile.ReadWrite.All,
Calendars.ReadWrite, LicenseAssignment.ReadWrite.All, MailboxSettings.ReadWrite, GroupMember.ReadWrite.All,
AuditLog.Read.All, Policy.Read.All, Reports.Read.All].
DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://graph.microsoft.com/v1.0/users/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx?$select=MailboxSettings

Headers:
FeatureFlag                   : 00000003
Cache-Control                 : no-store, no-cache
User-Agent                    : Mozilla/5.0,(Windows NT 10.0; Microsoft Windows 10.0.26200;
en-US),PowerShell/5.1.26100.7705
SdkVersion                    : graph-powershell/2.35.1
client-request-id             : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Body:


DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
NotFound

Headers:
Transfer-Encoding             : chunked
Vary                          : Accept-Encoding
Strict-Transport-Security     : max-age=31536000
request-id                    : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
client-request-id             : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
x-ms-ags-diagnostic           : {"ServerInfo":{"DataCenter":"xxxx
xx","Slice":"E","Ring":"4","ScaleUnit":"008","RoleInstance":"xxxxxxxxxxxxxxx"}}
Cache-Control                 : private
Date                          : Fri, 13 Feb 2026 00:00:00 GMT

Body:
{
  "error": {
    "code": "MailboxNotEnabledForRESTAPI",
    "message": "The mailbox is either inactive, soft-deleted, or is hosted on-premise.",
    "innerError": {
      "date": "2026-02-13T00:00:00",
      "request-id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
      "client-request-id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
    }
  }
}

The mailbox is either inactive, soft-deleted, or is hosted on-premise.

Status: 404 (NotFound)
ErrorCode: MailboxNotEnabledForRESTAPI
Date: 2026-02-13T00:00:00

Headers:
Transfer-Encoding             : chunked
Vary                          : Accept-Encoding
Strict-Transport-Security     : max-age=31536000
request-id                    : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
client-request-id             : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
x-ms-ags-diagnostic           : {"ServerInfo":{"DataCenter":"xxxx
xx","Slice":"E","Ring":"4","ScaleUnit":"008","RoleInstance":"xxxxxxxxxxxxxxx"}}
Cache-Control                 : private
Date                          : Fri, 13 Feb 2026 00:00:00 GMT

Get-MgUser : The mailbox is either inactive, soft-deleted, or is hosted on-premise.
Status: 404 (NotFound)
ErrorCode: MailboxNotEnabledForRESTAPI
Date: 2026-02-13T00:00:00
Headers:
Transfer-Encoding             : chunked
Vary                          : Accept-Encoding
Strict-Transport-Security     : max-age=31536000
request-id                    : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
client-request-id             : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
x-ms-ags-diagnostic           : {"ServerInfo":{"DataCenter":"xxxx
xx","Slice":"E","Ring":"4","ScaleUnit":"008","RoleInstance":"xxxxxxxxxxxxxxx"}}
Cache-Control                 : private
Date                          : Fri, 13 Feb 2026 00:00:00 GMT
At line:1 char:1
+ Get-MgUser -UserId xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx -Property Mai ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: ({ UserId = xxxx... , Headers =  }:<>f__AnonymousType15`4) [Get-MgUser
   _Get], Exception
    + FullyQualifiedErrorId : MailboxNotEnabledForRESTAPI,Microsoft.Graph.PowerShell.Cmdlets.GetMgUser_Get
DEBUG: [CmdletEndProcessing]: - Get-MgUser end processing.

</details>


### Configuration

Name Value

---

PSVersion 5.1.26100.7705
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.26100.7705
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1

Windows 11
x64

### Other information

_No response_