How can i update multivalued attribute in active Directory

Hello,

I try to update My active directory users proxyAddress attribute. Each person I have 2 SMTP address in my SharePoint list.

When I use Update Ad user  function it takes my strings just one value.

I try to use 2 times Update Ad user then it put only last SMTP address.

How can I add this 2 SMTP address like multi value?

Active directory proxyAddress is multi value attributes.

Thanks.