Hi,  I'm posting the follow question here as I was redirect to this mailing 
list for support by OpenVPN forum.

https://forums.openvpn.net/viewtopic.php?p=110748&hilit=error+0A00007B#p110748

This is a complex issue, and I am unsure whether this is an 
OpenVPN/OpenSSL/OpenSC issue or Yubikey libykcs11 issue.
For OpenVPN server/client I'm using elliptic curve TLS certificates and client 
certificate/key is imported into a Yubikey.
As workaround I can use cryptoapicert, however it's cumbersome, during OpenVPN 
client login process, as the smart-card pin query window directly popup behind 
OpenVPN client gui, so user need extra mouse clicks and move OpenVPN-client gui 
aside.
Furthermore,  it seems in case I've using Yubikey 5 with OTP interface for 
other purpose or I'm creating certificate/key in Yubikey 5 device the 
cryptoapicert will struggle, telling me,
this smartcard cannot be used for requested operation. Therefore, I'm still 
interested find causer for pkcs11 provider libykcs11.dll and opensc-pkcs11.dll 
not working with OpenVPN 2.6.

Any thoughts or hints on the possible issue causer are welcome.
I am also highly interested on input for further debugging 
possibilities/procedures.
I suspect OpenSSL 3.0.x in conjunction with PKCS11 PIV pkcs11-helper as a 
potential issue causer. Because a connection with OpenVPN 2.6 Server/Client is 
possible without using PKCS11 PIV.

Many thanks in advance!

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