Phabricator pull remote repository got "Command failed with error #128!"

make sure there is the root's id_rsa (not id_rsa.pub) content in the phabricator credential

References :

Setting up Phabricator to track a git repo | Dcycle

Phabricator log path

$ tail -f /var/tmp/phd/log/daemons.log

Phabricator allow everybody to view the dashboard

Allow nologin user

Config -> Policy -> policy.allow-public -> Allow Public Visibility -> Save Config Entry

Create public dashboard

Applications -> Dashboards -> Create Dashboard -> and set Visible To Public (No Login Required)

References :
How does one make a Phabricator instance public? - Stack Overflow