RE: Dynamics AX 2012 R3 User Authentication
Your requirement is not feasible I am afraid. Active Directory and a domain user account is required for AX 2012 since the only way to authenticate is through the Windows Integrated Security using the AD credentials.
The only way as a workaround would be to use Shift + Right click > Run as on the client executable/shortcut, with which you can run the AX client under a different credential. However, that sounds nonsense from a business perspective, since you would want to isolate access to your ERP system where security is delegated to individuals through security roles with limited access to the part of the system where they actually need to work. That is how you track who did want in your system. That is important for example in fraudulent system use situations where someone would change a bank account to their own, or writing off inventory as "loss" and shipping it out your backdoor. A universal account would not allow such granularity to see who did what, you would have to provide wider system access and lose accountability.