Bw cli give me BW_SESSION = null

I try to login to cli tool bw.
After I login with “bw login”
I get .

You are logged in!

To unlock your vault, set your session key to the `BW_SESSION` environment variable. ex:
$ export BW_SESSION="null"
> $env:BW_SESSION="null"

You can also pass the session key to any command with the `--session` option. ex:
$ bw list items --session null

I try to understand what is problem.

See Password Manager CLI | Bitwarden Help Center

Problem is that I have add access list in nginx proxy.
I can access my page but get log out after 1 sex.
Wen I remove access list in nginx proxy is working fin