As a solution, IBM support came up with this technote:
Be aware if you have the same issue!
This script sets the login properties to "uid;mail" for the internalFileRepository + it adds a mail address to the Websphere Administrator user. That is, if your WAS admin user is called "wasadmin"...
If your Was admin user has a different uid, you need to modify the .py script accordingly.
My WAS admin user has "stwasadmin" as an uid, and then I needed to change the scripts third last line from
AdminTask.updateUser ('[-uniqueName uid=wasadmin,o=defaultWIMFileBasedRealm -mail '+ adminEmail + ']')to
AdminTask.updateUser ('[-uniqueName uid=stwasadmin,o=defaultWIMFileBasedRealm -mail '+ adminEmail + ']')
So, heads up people...