How to Change Admin E-mail of Sync Up Watch

Hola, 

Does anyone know how to change which e-mail is the "admin" for a sync up watch?  I used one e-mail account when I got the watch but it doesn't match the e-mail address for my T-Mobile account so now the watch does not show up in the T Life app since the Sync Up Kids app doesn't work anymore.  I also cannot change my e-mail for the main TMO account since my other e-mail is already tied to another t-mobile ID (even thought I cannot even login it this account on t-mobile.com anymore since there are no phone numbers tied to it).

Any suggestions?  Customer care is not helpful beyond telling me to reset the watch but I don't see why this would change the admin e-mail (and if so that is very poor security if that is all that takes).  Also this will remove all of the contacts from the watch obviously.  My wife is still able to see the watch info in T-Life app since I added her a parent before the Sync Up kids app stopped working and this would also cause her access to go away too apparently.

¡Gracias!