PowerShell hashtable question - office 365 - powershell

Question

I need to set OOF message for around 80 users in O365.
I found a cmdlet Set-MailboxAutoReplyConfiguration which I can use to automate the procedure,
and it's looks fine but I'am probably missing something.
Here is the code:
$usersfile = import-csv "C:\Users\Out Of office bulk\Users.csv"
$setmailbox = #{
'Identity' = $usersfile.UserPrincipalName
'AutoReplyState' = 'Scheduled'
'externalaudience' = 'all'
'InternalMessage' = 'I am not here'
'ExternalMessage' = 'I am not here'
'StartTime' = '01/02/2020 01:00:00'
'EndTime' = '02/02/2020 23:00:00'
}
Set-MailboxAutoReplyConfiguration #setmailbox
my issue is with the Identity parameter,
when I run the $setmailbox
I can see that it showing the right UPN from the csv file:
Name Value
---- -----
AutoReplyState Scheduled
externalaudience all
Identity {blah#blah.com, blah2#blah.com}
StartTime 01/02/2020 01:00:00
EndTime 02/02/2020 23:00:00
InternalMessage I am not here
ExternalMessage I am not here
But when I run the script, i'am getting this error:
Cannot process argument transformation on parameter 'Identity'. Cannot convert the "System.Collections.ArrayList" value of type "System.Collections.ArrayList" to type "Microsoft.Exchange.Configuration.Tasks.MailboxLocationIdParameter".
+ CategoryInfo : InvalidData: (:) [Set-MailboxAutoReplyConfiguration], ParameterBindin...mationException
+ FullyQualifiedErrorId : ParameterArgumentTransformationError,Set-MailboxAutoReplyConfiguration
+ PSComputerName : outlook.office365.com
I've tried to change this:
'Identity' = $usersfile.UserPrincipalName
to almost any thing, and it didn't work.
Thanks a lot for your help.
PS:
I know that I can do something like that:
Import-Csv 'C:\Users.csv' | ForEach-Object {
$user = $_."UserPrincipalName"
Set-MailboxAutoReplyConfiguration `
-Identity $user -AutoReplyState Scheduled -StartTime "07/10/2018 01:00:00" `
-EndTime "7/15/2018 23:00:00" -InternalMessage "I am not here" -ExternalMessage "I am not here."
}
but for practice purposes I prefer to do it with the hash table in order to understand it better.
Solution:
thanks to #Lee_Dailey, I didn't noticed that the identity parameter accepts only one user each time, so the solution for multi user is to use the foreach-object.