Script to add users of particular AD OU to another AD group - powershell

Question

Running Powershell as an admin
I would like to have a script that I can run daily to add users from "cn=users,dc=costco,dc=com" to an AD group "groupname" "CN=groupname,OU=Groups,DC=costco,DC=com"
$When = (Get-Date).AddDays(-1).Date
Get-ADUser -SearchBase 'cn=users,dc=costco,dc=com' -Filter { whenCreated -ge $When } | add-adgroupmember -MemberOf 'groupname'
it errors out with
Add-ADGroupMember : A parameter cannot be found that matches parameter
name 'MemberOf'. At line:2 char:111
+ ... ilter { whenCreated -ge $When } | add-adgroupmember -MemberOf 'groupname ...
+ ~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Add-ADGroupMember], ParameterBindingException
+ FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.ActiveDirectory.Management.Commands.AddADGroupMember
I have also tried with the help of a redditor
When = (Get-Date).AddDays(-1).Date
Get-ADUser -SearchBase 'CN=users,dc=costo,dc=com' -Filter { whenCreated -ge $When } | ForEach-Object { Add-ADGroupMember -Identity 'Groupname' -Members $_ }
Error:
Add-ADGroupMember : Insufficient access rights to perform the
operation At line:2 char:109
+ ... ach-Object {Add-ADGroupMember -Identity ‘groupname’ -Members $_ } ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (groupname:ADGroup) [Add-ADGroupMember], ADException
+ FullyQualifiedErrorId : ActiveDirectoryServer:8344,Microsoft.ActiveDirectory.Management.Commands.AddADGroupMember

Answer 1

To make your first example work, you need to supply the pipeline value to the command, instead of trying to pass it in on the actual pipeline.
Try:
$group = "NewUsers"
Get-ADUser -SearchBase 'cn=users,dc=costco,dc=com' -Filter { whenCreated -ge $When } | %{ Add-ADGroupMember -Identity $Group -Members $_.samaccountname }