Hi and welcome to the powermator,
probably you are here because you were using Get-ADComputer and PowerShell threw an error looking like below
there are many reasons this error might happen but here I want to point out that when you use the -searchBase to search in a specific OU, PowerShell might get confused in Forest scenarios and threw this error. Here I want to share with you a small workaround to get over that.
My workaround involves telling PowerShell where exactly to search. In another word, you tell where your OU is expected to be found. So simply I modify the above code to something like below
(Get-ADComputer -Filter * -Server "something.someDomain.net" -SearchBase "OU=windows 10,OU=ou_computer,DC=something,DC=someDomain,DC=net" | select Name).count
and with that you get your error disappeared : )