I worked behind a VPN thanks to GFW.
The following error occurs after I "pip install -U leptonai & lep login"
requests.exceptions.SSLError: HTTPSConnectionPool(host='bjpfi5ey.bjz.edr.lepton.ai', port=443): Max retries exceeded with url: /api/v1/workspace (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1125)')))