Dear Victor,
The below worked for me:
subjectName = @alts
[alts]
otherName = 1.3.6.1.5.5.7.8.9;FORMAT:UTF8,UTF8String:виктор@например.рф
Thank you! It works, though it should be subjectAltName instead of subjectName
SY, Dmitry Belyavsky
The below worked for me:
subjectName = @alts
[alts]
otherName = 1.3.6.1.5.5.7.8.9;FORMAT:UTF8,UTF8String:виктор@например.рф