IT Error Decoder
Microsoft Graph PowerShell

How to Fix Invalid object identifier

Error message

Invalid object identifier '<value>'.

If you're seeing "Invalid object identifier", you're not alone. Here's what it means, why it happens, and the steps to resolve it.

What this error means

Microsoft Graph expected a GUID (object ID) but received something that is not a valid GUID format.

Why this happens

You passed a UPN, display name, or malformed string where Graph wanted an object ID, or copied a value with a stray space, quote, or newline.

Step-by-step fix

  1. Look up the real object ID using a Get-Mg* lookup before passing it.

    command
    $user = Get-MgUser -UserId 'jdoe@contoso.com'
$user.Id

  2. Trim and validate the GUID before use.

    command
    $id = $rawId.Trim()
[guid]::Parse($id) | Out-Null

  3. Re-run the original command using the resolved object ID.

Affected products

Microsoft Graph PowerShell

Still broken? Try these

  • Inspect the variable in PowerShell with `$id | Format-List` to see hidden characters.
  • If the value came from a CSV, re-import with `-Encoding UTF8` and check the column header.
  • Confirm the object still exists and was not soft-deleted.

Related errors

Frequently asked questions

What does "Invalid object identifier" mean?

Microsoft Graph expected a GUID (object ID) but received something that is not a valid GUID format.

What causes "Invalid object identifier"?

You passed a UPN, display name, or malformed string where Graph wanted an object ID, or copied a value with a stray space, quote, or newline.

How do I fix "Invalid object identifier"?

1. Look up the real object ID using a Get-Mg* lookup before passing it. 2. Trim and validate the GUID before use. 3. Re-run the original command using the resolved object ID. Always test changes in a non-production environment first.

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