NK3Mini with opcard firmware: key operation not possible: Invalid data

Nitrokeys FIDO2 / Nitrokey 3
1

I just tried out the opcard firmware on my NK3 Mini.
Flashing went fine:

 Successfully updated the firmware to version v1.2.2.

The next steps from the USAGE.md description:

$ gpg --edit-card --expert

gpg: WARNING: server ‘scdaemon’ is older than us (0.10.0 < 2.2.40)
gpg: Note: Outdated servers may lack important security fixes.
gpg: Note: Use the command “gpgconf --kill all” to restart them.
Reader …: [none]
Application ID …: D276000124011xxxxxxxxx
Application type .: OpenPGP
Version …: 11.50
Manufacturer …: ?
Serial number …: xxxxxxxxx
Name of cardholder: [not set]
Language prefs …: [not set]
Salutation …:
URL of public key : [not set]
Login data …: [not set]
Signature PIN …: forced
Key attributes …: rsa48 rsa48 rsa48
Max. PIN lengths .: 0 0 0
PIN retry counter : 0 0 0
Signature counter : 0
Signature key …: [none]
Encryption key…: [none]
Authentication key: [none]
General key info…: [none]

gpg/card> admin
Admin commands are allowed

gpg/card> key-attr
gpg: key operation not possible: Invalid data
gpg: error getting card info: Invalid data

gpg/card>

I tried re-connecting the NK3Mini, that did not change anything.
Also this must be my NK3Mini as gpg could not find any card when it was disconnected.

2

Not all algorithms are implemented, yet.

3

Well the site told to follow these instructions: opcard-rs/USAGE.md at main · Nitrokey/opcard-rs · GitHub
And in there, the exact commands I entered were given, but with a non-error output. So I saw this as a but that should be reported here.

Also, I never entered any command that told the card to use RSA algorithms, it errored out before.

But now there’s a new pre-release, so I’ll try everything again.