Employer Contact Registration-Step 1 of 3 This Screen allows an employer to store contact information on the OJI system. To use the system, the employer must provide their Account Number, Federal ID number(FEIN) and Registration Code. In The UI Account# field enter your 10 digit UI Account number. In the Federal Tax ID # field (FEIN), enter your FEIN #. In the Registration Code field, enter your registration code. This is the Employer Contact Code created when you registered to use the On-Line Service.