yesterday I upgraded my environment to the final MDT 2013 update 1 (sccm is on 2012 R2 SP1 with CU1)
since then when I want to use an mdt integrated task sequence with UDI, it halts in the pagenew computer details with the warning 'username format is invalid' like you can see here:
so it scrambled the username into some weird value.
this is happening when i reuse the existing UDI TS (but with the updated mdt toolkit and settings packages)
so also reusing the customsettings.ini where I specified the OSDjoinaccount (domainname\username) and OSDJoinPassword (containing the pw in cleartext) and reusing the modified config.xml from the other mdt package
then I tried with a newly generated config.xml and have the same issue.
this worked fine with the mdt 2013 update 1 beta, which I uninstalled, removed integration, installed mdt 2013u1 final, integrated again, generated a new dummy mdt TS to create the new packages
anyone who noticed this also?
Update: just tested with a new clean MDT UDI ts: same behavior!