Cannot bind parameter error message

Hello I am working with a script and getting an error that I am not sure how to deal with. Script snipit and error are below. My Google searches are not providing any help and any help is greatly appreciated!!

$username = Read-Host 'Enter Username'
$newadmin = Read-Host 'Enter New Admin'
$OneDriveUrl = Get-PnPUserProfileProperty -Account $username | select PersonalUrl
Set-SPOUser -Site $OneDriveUrl -LoginName $newadmin -IsSiteCollectionAdmin $True -ErrorAction SilentlyContinue

When running this script I am getting the error....
Set-SPOUser : Cannot bind parameter 'Site'. Cannot convert the "@{PersonalUrl=https://contoso-my.sharepoint.com/personal/printtest_contoso_com/}" value of type
"Selected.Microsoft.SharePoint.Client.UserProfiles.PersonProperties" to type "Microsoft.Online.SharePoint.PowerShell.SpoSitePipeBind"

Im not sure why it wont take the value from the $OneDriveUrl paramater.