Move multiple users from Skype on-premises to Skype Online - Bulk Move-CSUser

There isn't much to be found about this.
I needed to move a list of users from our on-premises Skype for Business 2015 servers to Skype Online.
I know how to do this one user at a time.

$cred = Get-Credential username@tenanant.com            
Move-CsUser -Identity UPN -Credential $cred -Target sipfed.online.lync.com -Confirm:$false

Thats nice and all, but I had a list of 15 users.

I came across this post from Brett Janzen:

https://brettjanzen.wordpress.com

He deserves a shit load of traffic to his site for this strike of genius :-)

He created a script to move users from on-premises to Online, to check if they are enabled if the move went well or not and notify you of this by email.

His version can be found here, I made some adjustments because my environment reacted a bit differently.

# Edit this script at lines: 4, 13, (possibly at 17), 23, 32, 46, 51 and 58 to 61            
            
#This 1 liner creates the hash file that we will need in the next script. Needs to be run only the first time, or if password changes            
Read-Host -Prompt "Enter your tenant password" -AsSecureString | ConvertFrom-SecureString | Out-File "cred.txt"            
             
#-------------------------            
#Script starts here:            
#-------------------------            
            
#Time Stamp used for file naming            
$DTStamp = get-date -f "dd-MM-yyyy HH-mm"            
#This uses a hash value of the password for the service user. This will allow us to run the script with out being asked            
$AdminName = "username@tenant.onmicrosoft.com"            
$Pass = Get-Content "cred.txt" | ConvertTo-SecureString            
$credential= new-object -typename System.Management.Automation.PSCredential -argumentlist $AdminName, $Pass            
#Initialize session            
$session = New-CsOnlineSession -Credential $credential #-OverrideAdminDomain "domain.com"            
Import-PSSession $session -AllowClobber            
Set-ExecutionPolicy Unrestricted -force            
#The Beginning of the inspection of users that will be moved            
#Does the userlist file exist?            
If ((test-path "userlist.txt") -eq $False) {            
Send-MailMessage -from "Skype@domain.com" -to "admin@domain.com"-subject "Skype Migrations: No File" -body "Looks like we dont have a file to work with" -smtpServer smtp.domain.com            
}else{            
#check to see if the users are enabled. This will output new file for working with.            
ForEach ($UserToBeMigrated in (Get-Content userlist.txt)) {            
get-csuser $UserToBeMigrated | Where-object {$_.Enabled -eq $False} | Select-object -expandProperty sipaddress | Out-File NotEnabledUsers.txt -append            
get-csuser $UserToBeMigrated | Where-object {$_.Enabled -eq $True} | Select-object -expandProperty sipaddress | Out-File EnabledUsers.txt -append            
}            
#Start of moving users to the cloud with enabledusers.txt            
ForEach ($UserToBeMigrated in (Get-Content EnabledUsers.txt)) {            
Move-CsUser $UserToBeMigrated -Target sipfed.online.lync.com -Credential $credential -Confirm:$False #-verbose #-HostedMigrationOverrideUrl "https://youradmindomainname.online.lync.com/HostedMigration/hostedmigrationservice.svc" -ProxyPool "proxypool.domain.com"             
}            
# Lets give it a pause for any replication delays            
Start-Sleep 60            
#Lets verify the users where migrated            
ForEach ($UserToBeMigrated in (Get-Content EnabledUsers.txt)) {            
Get-CsUser $UserToBeMigrated | where-object {$_.hostingprovider -ne "sipfed.online.lync.com"} |Select-object -ExpandProperty Sipaddress | out-file LeftOvers.txt -Append            
}            
#If there were users that didnt move it will show up in the left overs file            
If ((Get-Content "LeftOvers.txt") -eq $Null) {            
ForEach ($UserToBeMigrated in (Get-Content EnabledUsers.txt)) {            
get-csuser $UserToBeMigrated | select-object SipAddress, HostingProvider | Out-file completedList.txt -append            
}            
#If it passes lets send an email to the admin with some txt files to look through if he or she wants to            
Send-MailMessage -from "Skype@domain.com" -to "admin@domain.com" -subject "Move Complete" -body "Passed on first try. Logs attached" -Attachment "CompletedList.txt","NotEnabledUsers.txt" -smtpServer smtp.domain.com            
#Cleanup!            
rename-item -path completedList.txt -newName "CompletedList- $DTStamp.txt"            
} else {            
#If there is failure email and let the admin know            
Send-MailMessage -from "Skype@domain.com" -to "admin@domain.com" -subject "Move Had Errors" -body "Looks like there was a failure. Logs attached" -attachment "LeftOvers.txt" -smtpServer smtp-lb.domain.com            
#Here we could add another try to see if we can move the users again. This is a work in progress            
}            
}            
#Close them sessions            
get-pssession | remove-pssession            
#Clean Up            
rename-item -path "D:\Scripts\Move-CSUser to Skype Online\leftovers.txt" -newName "_LeftOvers- $DTStamp.txt"            
rename-item -path "D:\Scripts\Move-CSUser to Skype Online\userlist.txt" -newName "_UserList- $DTStamp.txt"            
rename-item -path "D:\Scripts\Move-CSUser to Skype Online\NotEnabledUsers.txt" -newName "_NotEnabledUsers- $DTStamp.txt"            
rename-item -path "D:\Scripts\Move-CSUser to Skype Online\EnabledUsers.txt" -newName "_EnabledUsers- $DTStamp.txt"