Apex Flex Vivokey SmartPGP Issues?

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8

While I’m at it, RSA 4096 isn’t working, either:

...

ssb* rsa4096/94D41DFC6D43CE9C
     created: 2017-08-12  expires: 2024-05-09  usage: S   
...

gpg> keytocard
Please select where to store the key:
   (1) Signature key
   (3) Authentication key
Your selection? 1
gpg: KEYTOCARD failed: Card error

git/SmartPGP/bin on  master [!?] via 🐍 3.9.0 
➜ vim ../src/fr/anssi/smartpgp/Constants.java

…

    protected static final short INTERNAL_BUFFER_MAX_LENGTH =¬                  
        (short)0x730;

git/SmartPGP/bin on  master [!?] via 🐍 3.9.0 
➜ ./smartpgp-cli switch-rsa4096 -p REDACTED                         
Select OpenPGP Applet
90 00
Verify Admin PIN
90 00
Switch to RSA4096 (sig)
90 00
Switch to RSA4096 (dec)
90 00
Switch to RSA4096 (auth)
90 00

I’m decently-technical and have been using gpg etc for years now. I simply don’t understand what I’m supposed to do, apparently?