L4 Card NV_ENC_CAPS_ASYNC_ENCODE_SUPPORT

Hello,

When I query NVENC capabilities from L4 card on windows system, I get NV_ENC_CAPS_ASYNC_ENCODE_SUPPORT = 0.
Doas L4 card not support async encoding or is there an other problem?

OS: Windows Server 2022

Thank you advance for your kind concern.
Salih