Update-MgSiteListItemField Doesn't Work

[12Knocksinna]

Describe the bug

I am trying to use the Update-MgSiteListItemField cmdlet to update a field in a SharePoint list item. The cmdlet succeeds (no error) but nothing happens. Running the Graph request with Invoke-MgGraphRequest works.

Expected behavior

I expect the field in the site list item to be updated by the cmdlet.

How to reproduce

$NewFields = @{}
$NewFields.Add("Username", "Ben Lee")

$ListItemId = '6'
$Response = Update-MgSiteListitemField -ListId $List.Id -ListItemId $ListItemId -SiteId $Site.Id -BodyParameter $NewFields -ErrorAction Stop

• Fails (no update)

$Uri = ("https://graph.microsoft.com/v1.0/sites/{0}/lists/{1}/items/{2}/fields" -f $Site.Id, $List.Id, $ListItemId)
Invoke-MgGraphRequest -Uri $Uri -Method PATCH -Body $NewFields

• Succeeds. Same payload, same list id...

SDK Version

2.36.1

Latest version known to work for scenario above?

Unknown

Known Workarounds

Use Graph request

Debug output

HTTP Method:
PATCH

Absolute Uri:
https://graph.microsoft.com/v1.0/sites/redmondassociates.sharepoint.com%2Cacfe74d8-edfb-436d-924b-e018666605ee%2Ca2aba197-5f1d-4864-a2c7-4daf0ff6379b/lists/fbb2de65-ea1a-4c6f-9392-063b4ffcf4aa/items/6

Headers:
FeatureFlag : 00000003
Cache-Control : no-store, no-cache
User-Agent : Mozilla/5.0,(Windows NT 10.0; Microsoft Windows 10.0.26200; en-IE),PowerShell/7.6.1
SdkVersion : graph-powershell/2.36.1
client-request-id : b01f4f13-cda5-4967-a73b-3298b777f69e
Accept-Encoding : gzip,deflate,br

Body:
{
"Username": "Ben Lee"
}

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

Status Code:
OK

Headers:
Cache-Control : no-cache
ETag : "7f93f3b1-90ca-4ba7-adce-43ee1785781f,8"
Vary : Accept-Encoding
Strict-Transport-Security : max-age=31536000
request-id : 6b549be0-6e20-48e6-a327-0507e5af2dca
client-request-id : b01f4f13-cda5-4967-a73b-3298b777f69e
x-ms-ags-diagnostic : {"ServerInfo":{"DataCenter":"North Europe","Slice":"E","Ring":"4","ScaleUnit":"010","RoleInstance":"DB1PEPF000BA273"}}
splogid : 9d5c10a2-503b-a000-16d3-2631d8591cf6
odata-version : 4.0
Date : Mon, 04 May 2026 15:30:44 GMT

Body:
{
"@odata.context": "https://graph.microsoft.com/v1.0/$metadata#sites('redmondassociates.sharepoint.com%2Cacfe74d8-edfb-436d-924b-e018666605ee%2Ca2aba197-5f1d-4864-a2c7-4daf0ff6379b')/lists('fbb2de65-ea1a-4c6f-9392-063b4ffcf4aa')/items/$entity",
"@odata.etag": ""7f93f3b1-90ca-4ba7-adce-43ee1785781f,8"",
"createdDateTime": "2026-04-20T16:44:52Z",
"eTag": ""7f93f3b1-90ca-4ba7-adce-43ee1785781f,8"",
"id": "6",
"lastModifiedDateTime": "2026-05-04T15:30:45Z",
"webUrl": "https://redmondassociates.sharepoint.com/sites/O365ExchPro/Lists/Planner%20Task%20Burndown/6_.000",
"createdBy": {
"user": {
"displayName": "SharePoint App"
}
},
"lastModifiedBy": {
"application": {
"id": "14d82eec-204b-4c2f-b7e8-296a70dab67e",
"displayName": "Microsoft Graph PowerShell"
},
"user": {
"email": "Tony.Redmond@redmondassociates.org",
"id": "eff4cd58-1bb8-4899-94de-795f656b4a18",
"displayName": "Tony Redmond"
}
},
"parentReference": {
"id": "c7142fbc-ed07-430c-8a06-780655d1ce88",
"siteId": "redmondassociates.sharepoint.com,acfe74d8-edfb-436d-924b-e018666605ee,a2aba197-5f1d-4864-a2c7-4daf0ff6379b"
},
"contentType": {
"id": "0x0100E0C23798F09A8D48AEF4C79EF9CDECCE008D6A5AB1E014D547963D51F206398C72",
"name": "Item"
},
"fields@odata.context": "https://graph.microsoft.com/v1.0/$metadata#sites('redmondassociates.sharepoint.com%2Cacfe74d8-edfb-436d-924b-e018666605ee%2Ca2aba197-5f1d-4864-a2c7-4daf0ff6379b')/lists('fbb2de65-ea1a-4c6f-9392-063b4ffcf4aa')/items('6')/fields/$entity",
"fields": {
"@odata.etag": ""7f93f3b1-90ca-4ba7-adce-43ee1785781f,8"",
"Title": "310e60f7-f1a0-48ec-8e63-630a86fa42b2",
"LinkTitle": "310e60f7-f1a0-48ec-8e63-630a86fa42b2",
"RunDate": "2026-04-20T15:44:00Z",
"Plan": "MAC Tasks",
"Tasks": 16.0,
"Averagedaysoutstanding": 75.69,
"UPN": "Ben@bibblenet.com",
"Username": "Ben Lee",
"id": "6",
"ContentType": "Item",
"Modified": "2026-05-04T15:30:45Z",
"Created": "2026-04-20T16:44:52Z",
"AuthorLookupId": "1073741822",
"EditorLookupId": "3",
"_UIVersionString": "8.0",
"Attachments": false,
"Edit": "",
"LinkTitleNoMenu": "310e60f7-f1a0-48ec-8e63-630a86fa42b2",
"ItemChildCount": "0",
"FolderChildCount": "0",
"_ComplianceFlags": "",
"_ComplianceTag": "",
"_ComplianceTagWrittenTime": "",
"_ComplianceTagUserId": "",
"AppAuthorLookupId": "100",
"AppEditorLookupId": "57"
}
}

DEBUG: [CmdletEndProcessing]: - Update-MgSiteListItem end processing.

</details>


### Configuration


Name                           Value
----                           -----
PSVersion                      7.6.1
PSEdition                      Core
GitCommitId                    7.6.1
OS                             Microsoft Windows 10.0.26200
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.4
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

### Other information

_No response_

[ramsessanchez]

Hi @12Knocksinna , I ran the code you shared and was unable to reproduce the error you described. For me, in every instance the update was successful. Furthermore, in your shared debug output, the response you shared contained the correct updated value.

[12Knocksinna]

@ramsessanchez Hi there and thanks for running the code. It definitely didn't work for me many times today. It's late here right now and I will try again tomorrow with a new PowerShell session, new code, and new hope...

[12Knocksinna]

I've closed this because the cmdlet works. I have no idea why it wasn't working yesterday except for incompetence on my part....