Replacing all addresses in proxyaddresses with array

Question

we have local AD that synchronizes to O365
we are adding a new email address with new domain to all users in two phases.
1) add new email address and let settle.
2) make new email address the primary email address (smtp: -> SMTP:)
I have a script I found where everything seems to work until the last command:
Set-ADUser -identity $UserName -Replace @{ProxyAddresses=$NewProxyAddresses}
The error I get with this command is:
Invalid type 'System.Management.Automation.PSObject'.
Parameter name: ProxyAddresses
    + CategoryInfo          : InvalidArgument: (user:ADUser) [Set-ADUser], ArgumentException
    + FullyQualifiedErrorId : Invalid type 'System.Management.Automation.PSObject'.
Parameter name: ProxyAddresses,Microsoft.ActiveDirectory.Management.Commands.SetADUser
The output of $NewProxyAddresses is:
smtp:[email protected]
smtp:[email protected]
X400:C=us;A= ;P=Company;O=Exchange;S=surname;G=givenname;
SMTP:[email protected]
The output of the $newProxyAdderesses is correct, but I am unable to run the set-aduser command

Answer 1

If I read the existing value into a variable:
$proxy = get-aduser identity $username -property proxyAddresses | select -expand proxyAddresses
And try to add or replace using that variable I get the same error.  If I read each of those values into a new variable, I can't add a single one of them without getting the same error:
$j = @()
foreach ($y in $proxy){$j+= $y}
If I copy the individual addresses text on screen and create a new array with those it works:
$newproxy = @()
$newproxy += "smtp:[email protected]"
$newproxy += "SMTP:[email protected]"
$newproxy += "X400:c=US;a= ;p=company;o=city;s=last;g=first;"
Both variables are the same type:
PS C:\Windows\system32> $proxy.gettype()
IsPublic IsSerial Name                                     BaseType
True     True     Object[]                                 System.Array
PS C:\Windows\system32> $newproxy.gettype()
IsPublic IsSerial Name                                     BaseType
True     True     Object[]                                 System.Array
If I output the contents of both variables to text files and compare them with Notepad++ they are the same.  So I am stumped as to a specific explanation, but what I can tell you is how you construct your variable is most likely what's causing
the problem.
Also, when you do construct your variable, build it in reverse order.  The address you want listed first should be the last one in the array, as the top of the list shows the most recently added address.
I hope this post has helped!