auth not working with ZScaler VPN

[diwakar-in]

Problem authing (with Zscaler), even after

% humanlog config hack for-netskope
% humanlog auth whoami             
┃ You're logged out. Would you like to login?                                                                                                                             
┃                                                                                                                                                                         
humanlog> looking up local user state: performing login: requesting auth URL: internal: protocol error: no Grpc-Status trailer: unexpected EOF

cc @aybabtme