I sent an email to KCC:
Hello Sir/Madame,
I get this error message "The Case Number entered is currently unavailable. Please try again later or contact the Kentucky Consular Center (KCC) by email (kccdv@state.gov) or by phone (Public Inquiry Phone Number 606 -526-7500 7:30 am to 4:00 pm EDT Monday - Friday) for further assistance.’’ I cannot login to fill in the DS-260 form. Could you help me, please?
Sincerely Thank you.
KCC replied that 1:
Thank you for your inquiry.
If you are trying to access the DS-260 and receiving an error message stating that your date of birth is incorrect, it is because the date you are entering does not match the date from your original DV entry form. To access the DS-260 you must use the date of birth you used when you submitted your original electronic entry. The Kentucky Consular Center cannot provide this information for you. Please be sure that you are selecting the correct day, month, and year, in the format required by the form.
If the date you are entering is your correct date of birth, it is possible that you made an error on your original entry. If you do not know the date you used on your original entry form, you will not be able to access the DS-260 application. The DS-260 is required for visa processing in the DV program.
KCC replied that 2:
If you are trying to access the DS-260 and receiving an error message stating that your date of birth is incorrect, it is because the date you are entering does not match the date from your original DV entry form. To access the DS-260 you must use the date of birth you used when you submitted your original electronic entry. The Kentucky Consular Center cannot provide this information for you. Please be sure that you are selecting the correct day, month, and year, in the format required by the form. If the date you are entering is your correct date of birth, it is possible that you made an error on your original entry. If you do not know the date you used on your original entry form, you will not be able to access the DS-260 application. The DS-260 is required for visa processing in the DV program.
When entering the “Principal Applicant’s Surname” into CEAC, ensure you are using only the applicants Last/Family name as entered on the original entry. Note* the Last/Family name appears to the left of the comma (,) on the original entry confirmation form.