Microsoft 365 Password Expiration Notification Email Solution for On-Premises AD Accounts

I currently have this script setup and running on our primary domain.  The script is running via a scheduled task.  We have a separate domain that we have a trust with, and I would also like to get this running against those users.  Is there a simple way to point it to that domain as well?  Or, will I need to set this up with another app registration and run it locally on that domain? 

If I modify line 63 as such- $users = get-aduser -server "DC.newdomain.local" -filter * -SearchBase "OU=Departments,DC=newdomain,DC=local"-properties Name, PasswordNeverExpires, PasswordExpired, PasswordLastSet, EmailAddress |where {$_.Enabled -eq "True"} | where { $_.PasswordNeverExpires -eq $false } | where { $_.passwordexpired -eq $false }

I can get that to pull the users by using the -server option just running that line, but when I try to run the entire script I get the "Failed to aquire token" error.  

Figured I would try to comment here and hope for a response before I go through the trouble of setting up another instance.

Edit: I was able to get this working without having to setup a new app registration.  For anyone else who might be trying to do the same, I basically just copied the entire script and pasted it below in the existing powershell file.  I made my modifications to the bottom portion to point to the separate domain, OU, log file, etc. and it was successful running.