• YubiKey Manager (ykman) version: 4.0.3
• How was it installed?: choco
• Operating system and version: Windows 10
• YubiKey model and version: YubiKey 5 NFC
• Bug description summary: Unsupported attribute: 'emailAddress'

Steps to reproduce

Create new CSR with ykam for S/MINE

ykman piv keys generate --algorithm ECCP384 --format PEM 9c public.pem
ykman piv certificates request --subject "CN=James Smith,OU=Sales,L=Redwood Shores,O=OpenLDAP,ST=California,C=US,[email protected]" 9c public.pem csr.csr

This will error with Unsupported attribute: 'emailAddress'

Expected result

A CSR with an emailAddress attribute in the subject

Actual results and logs

Error: Unsupported attribute: 'emailAddress'

Other info

I like to use the Yubikey Manager to let users create an CSR for X.509 based certificates to use with S/MINE.
Of cource this needs the emailAddress as attribute in the subject. This is currently not supported by ykman.