Event: git clone https://source.developers.google.com/p/xxxxxxx/r/xxxx
Error: Invalid authentication credentials. Please generate a new identifier: https://source.developers.google.com/new-password
Solution:
Don’t forget gcloud init
for initial your data login.
[1] Open https://source.developers.google.com/new-password
[2] Select your login
[3] Copy Configure Git

[4] Goto Command Prompt Window



[5] Paste your Configuration Git



[6] Clone again: git clone https://source.developers.google.com/p/xxxxxxx/r/xxxx
Done.