Email addresses and cell phone numbers can be designated as being able to be used by multiple usernames by a user that has the privileges of accessing Configuration>>Preparer(s) Menu and making a designation for the email address (see below).
If you have multiple usernames and are in the process of completing the Account Update page you will get the following notification box if something you entered is not unique (primarily seeing this for cell phone number). If you are getting this on an email address, then see information above.
Updated 10/18/2017: This dialog box no longer exists
You will see a Unique Notification dialog box. Click the X — DO NOT click Sync Accounts. This is a service for our commercial accounts that have to login to multiple programs other than just Pro Online to create a single sign-in. This does not apply to VITA/TCA because we incorporate things like Management Reports into the application.
Closing this dialog box will allow you to see what field is not unique…see example below of the cell phone number not being unique because I have already used it on another one of my user names. My only option for receiving my authentication code for multiple user names is via Email. Also, clicking the link in the Account Update message is not applicable to VITA/TCE.
Blog Posted 09/07/2017 11:07 AM Eastern