<FYI, this was resolved in version 10.3.5>
Here’s a horrendous bug I just came across in the field today while deploying a XenMobile 10.3 Proof of Concept with a customer.
Post the initial deployment of the OVF on vSphere, i ran the usual CLI wizard to IP the appliance and create the database. After restart the web ‘Administrator’ user account just would not accept the password i provided during the wizard.
On closer inspection of the database by comparing with my own lab (never POC without a LAB!) , the ‘administrator’ username was completely missing from the database under ‘dbo.security_principal’…
what the ‘crappity crap’ went wrong I don’t know. but I reproduced it 4 times in numerous tests.
I managed to find a workaround involving specifying a different username. I.E. delete your deployment and database and when the wizard prompts for the ‘administrator’ name with default value, specify something different.
In my case I specified ‘zdmadmin’ and this worked correctly allowing me to get the hell out in time for a Friday beverage.

I hope this helps anyone else facing this issue!