bulk licence activation, office professional plus for faculty

Hi, to all

I was sent here from the office365 community forums.

I hope someone can help...

I need a way to assign / activate office 365 licences to all the users on a specific domain in our organization.

We have 3500+ users, currently all of them have an "Microsoft Office 365 Plan A2 for Faculty" license and I need to add the"Office Professional Plus for Faculty" license to all of them.

We have 2 domains: @conaculta.onmicrosoft.com  and  @conaculta.gob.mx and I need to add the "Office Professional Plus for Faculty" only to the users in the @conaculta.gob.mx domain.

Is the a way to do this via Power Shell?

So far i have installedthe Microsoft Online Service Sign-in Assistant and the Window's Azure Active Directory Module but i have no idea of how to make them work

Any help will be appreciated.

thanks to all.

Jorge.