Usernames in AZURE/WAP environment have the form: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX. There is no way to identify which account and/or subscription this ID is connected to in OA (the only way is to check every customer, but it is not acceptable when there are many accounts/subscriptions) similar to Services > Cloud Infrastructure > Windows Azure Pack > Subscriptions.
There is no such functionality in OA in current version. Feature request CCU-11308 to add tab Services > Cloud Infrastructure > Windows Azure Pack > Accounts/Users has been submitted to implement this functionality in future versions.
Please contact your Account Manager to trace the status of the feature request.