Individual developer in Romania: Tax ID field does not accept the personal CNP

I am an individual Microsoft Store developer resident in Romania, with no company. The tax profile requires a Tax ID, but the only types offered are CIF (10 digits) and CUI (RO plus 10 digits), which are company formats. My only tax identifier is the 13-digit personal CNP, which the field does not accept. Which entry is supported for this country and account type? I will not enter a placeholder or a shortened number.