U2F fails in batch mode

When using batch mode with a 2FA Yubikey enabled account, keeper prompts for the U2F touch however immediately falls through to a 2FA code prompt, as if “Enter” had been pressed.

env:

% sw_vers 
ProductName:	Mac OS X
ProductVersion:	10.15.4
BuildVersion:	19E287
% keeper --version                                         
Keeper Commander, version 4.31

• keeper installed via pip3, per readme

repro:

% rm config.json
% echo 'whoami' | keeper --user '[e-mail]' -
Password:

Touch the flashing U2F device to authenticate or press Enter to resume with the primary two factor authentication...
Two-Factor Code:

• same thing when using --batch-mode shell
• fwiw, the yubikey begins flashing at the expected time; entering a valid code succeeds

[sk-keeper]

I’m not sure if it is documented but Commander is supposed to suppress command errors if commands start with @ For instance:

@mkdir "Folder"

does not fail if the folder exists

[sk-keeper]

Also the Commander’s commands can be stored to some file then keeper --user "${keeperuser}" <filename> Commander will execute commands from the file.

login ${keeperuser}
whoami
ls