Set-PnPTaxonomyFieldValue gives 'cannot bind parameter' error

Question

I am using PnP.Powershell version 2.12.0.

I am trying to set values of two new managed metadata columns in a list using values from other columns. But I keep getting the following error:

Cannot bind parameter 'ListItem'. Cannot convert the "System.Collections.Generic.Dictionary2[System.String,System.Object]" value of type | "System.Collections.Generic.Dictionary2[[System.String, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object,
| System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]" to type "Microsoft.SharePoint.Client.ListItem".

First I get the list item and the relevant fields as follows:

$colItems = (Get-PnPListItem -List $oList -id 236 -Fields “Orig Field 1”, “Orig Field 2”, “New Field 1”, “New Field 2”).FieldValues

This is technically a collection, so I used a forEach loop to get $oItem. All the columns are managed metadata fields.

Then I tried two approaches to setting "New Field 1"

Set-PnPTaxonomyFieldValue -ListItem $oItem -InternalFieldName 'New Field 1' -TermID "ID String"

Where "ID String" is actually the GUID for the term, and

Set-PnPTaxonomyFieldValue -ListItem $oItem -InternalFieldName 'DEDiscipline' -TermPath = $NewValue

Where $NewValue is in the form "Term Group|Term Set|Term"

Nothing works, and I keep getting the error above. I have gone into Entra ID admin and added additional permissions in Microsoft Graph and SharePoint, so I have Sites.FullControl.All in both.

I have also tried using just Set-PnPListItem as follows:

Set-PnPListItem -List $oList -Identity $oItem -Values @{"New Field 1"=$NewValue}

I've pasted my API permissions below:

I use the following syntax for connecting:

Connect-PnPOnline -Url $SiteURL -ClientId <clientID> -Tenant <Domain>.onmicrosoft.com -Interactive

Answer 1

I can reproduce your error.

When u use:

$colItems = (Get-PnPListItem -List $oList -id 236 -Fields “Orig Field 1”, “Orig Field 2”, “New Field 1”, “New Field 2”).FieldValues

You don't get a ListItem object but a collection of field values. You should remove .FieldValues so you get a ListItem oject.

So try:

$listItem = (Get-PnPListItem -List $oList -id 236 -Fields “Orig Field 1”, “Orig Field 2”, “New Field 1”, “New Field 2”)
Set-PnPTaxonomyFieldValue -ListItem $listItem -InternalFieldName 'New Field 1' -TermID "ID String"

comment by TS

Thanks! I tried that and it worked. I still need to access the list of fields, to pull some values, but now I do it using the following:

$NewValue = $PathPrefix + $ListItem.FieldValues.OrigField1.Label

@Danny, I appreciate the help!