[BUG] When using Set-PnPListItem in batch mode managed metadata column values are not being set when multiple terms are provided

[kboschman]

Reporting an Issue or Missing Feature

Reporting an issue

Expected behavior

Script:

$list = 'List'
$ID = 1
# Store the terms in an array
$terms = @()
terms += 'TermGroup|TermSet|Term1'
terms += 'TermGroup|TermSet|Term2'

$batch = New-PnPBatch

Set-PnPListItem -List $list -Identity $ID -UpdateType "UpdateOverwriteVersion" -Values @{"ManagedMetadataTest" = $terms;} -Batch $batch

Invoke-PnPBatch -Batch $batch

After execution of the script, the ManagedMetadataTest column should contain the 'Term1' & 'Term2' values.

Actual behavior

The ManagedMetadataTest column is empty.
If the Set-PnPListItem command is executed without the batch parameter, the ManagedMetadataTest column is updated correctly.
Also, if only 1 term is specified, as a string, the Set-PnPListItem command works in batch mode.

Steps to reproduce behavior

1. Create a term set with multiple terms
2. Create a managed metadata column called 'ManagedMetadataTest' in a document library based on the existing term set
3. Create a file in this library and get the ID of the file
4. Update the variables in the script & execute the script

What is the version of the Cmdlet module you are running?

Manifest 2.12.0 PnP.PowerShell Core

Which operating system/environment are you running PnP PowerShell on?

• Windows
• Linux
• MacOS
• Azure Cloud Shell
• Azure Functions
• Other : please specify