Fix “Parameter set cannot be resolved using the specified named parameters” Error in PowerShell

Problem: When running a PowerShell script or command, you might encounter the error “Parameter set cannot be resolved using the specified named parameters.”

#Parameters
$SiteURL = "https://salaudeen.sharepoint.com/sites/Retail"
$ListName = "Projects"
$ListItemID = 13
$AttachmentFile = "MonthlyRpt.csv"

#Connect to SharePoint Online Site
Connect-PnPOnline -Url $SiteURL -Interactive

#Remove Attachment file from a list item
Add-PnPListItemAttachment -List $ListName -Identity $ListItemID -FileName $AttachmentFile

Root Cause: This error occurs when PowerShell is unable to determine which parameter set to use due to ambiguity, missing parameters, or incorrect parameter combinations.

Solution

Here is the troubleshooting checklist to resolve this error:

1. Check for typos in parameter names: Ensure that you have spelled the parameter names correctly and that they match the names specified in the cmdlet or script. Here is the screenshot, the Add-PnPListItemAttachment cmdlet doesn’t have the “-FileName” parameter. 
2. Verify mandatory parameters: Make sure you have provided all required parameters for the cmdlet or function. You can check the mandatory parameters by running Get-Help on the cmdlet or function:

Get-Help Your-Command -Detailed

3. Confirm parameter set membership: Some cmdlets and functions support multiple parameter sets, and each set has its own combination of parameters. Ensure that you’re using the correct parameters for the intended parameter set. You can find this information in the cmdlet or function’s help documentation.
4. Avoid parameter ambiguity: If a cmdlet or function has multiple parameter sets with overlapping parameters, PowerShell might not be able to determine which set to use. In this case, make sure you’re using a unique combination of parameters that clearly identifies the intended parameter set.
5. Review the default parameter values: If you’re relying on default parameter values, ensure that they are set correctly and that they do not cause ambiguity among parameter sets.
6. Update the cmdlet or script: If you’re using a custom cmdlet or script, review its parameter sets, and make necessary adjustments to remove any ambiguity or incorrect parameter combinations.

By following these steps, you should be able to resolve the “Parameter set cannot be resolved using the specified named parameters” error and execute your PowerShell script or command successfully.