Could not add card "/usr/lib/opensc-pkcs11.so": agent refused operation

ssh agent refused operation

System: MacOS Sonoma 14.1.2

First, try to unplug and plug back the Yubikey.

Second, try rebooting the system.

Make sure `opensc` package is up to date. I am using Macports to install utilities/libraries and other command-line utils.
```
$ sudo port upgrade opensc
```

The issue is that the library `opensc-pkcs11.so` is installed in a location which is not whitelisted by the system. You will need to copy the library to `/usr/local/lib/`.
```
$ cd /usr/local/lib
$ sudo cp opensc-pkcs11.so opensc-pkcs11.so.backup
$ sudo cp /opt/local/lib/opensc-pkcs11.so .
```

Kill `ssh-agent`:
```
$ ssh-agent -k
```

Restart `ssh-agent`:
```
$ eval `$(ssh-agent -s)`
```

Try loading the opensc library again:
```
$ ssh-add -s /usr/local/lib/opensc-pkcs11.so
```