This keep popping up

[winged narwhal]

when i try to join a game this pops up

[warm umbra]

Google the error code and also check out this site.
https://nvidia.custhelp.com/app/answers/detail/a_id/4263/~/gamestream-error-codes

If both give no results, contact NVCC support.

Ticket:
https://nvidia.custhelp.com/app/ask

Live chat:
https://nvidia.custhelp.com/app/chat/chat_launch/

PS: In case, after you log in, it shows a permission error, just press CTRL+Shift+R if you're using any Chromium browser (Chrome, Edge, etc) and then try again.