When you log on to the Apporto desktop the first time, you will receive the following prompts from Microsoft Office
What to do:
Click Sign in and enter your SMU Email Address as shown below

Enter your SMU email address as shown below

Check the box and click next - Your Username is pre-populated from the previous prompt. Click Next.

You may also see this prompt

What to do:
Simply enter your SMU email address and click next
Why does this happen?
The apporto virtual desktop is not a domain joined computer - which would pass your SMU credentials through automatically.
Apporto provisions a unique user account for you when you log in, which stores your settings, but it is not your SMU Active Directory / O365 account.
For this reason, O365 needs to know who you are to connect you to your data.
Once you are logged in, all your editing history, pinned documents, and sharing data is available to you within the applications.
This is more like installing O365 on your personal computer and launching it for the first time - you would receive a prompt to provide your work or school account information.
O365 is installed in Shared Computer Activation mode in the apporto desktop. This means that if you are prompted to activate office it does NOT count against your allotted count of 5 devices included with your SMU O365 License.
After you authenticate to one of the O365 apps - Such as Word,PowerPoint, or Excel you are authenticated to all.
These settings should persist between virtual desktop sessions - so you should not be prompted each time you log in to apporto.
You may on occasion receive the prompts again as O365 periodically requires you to re-authenticate.