HTTPS: user does not exist

Problem Solution
git clone https://ConnectorHost/gD1/repo8

results in

Cloning into 'gD1/repo8'...
Username for https://ConnectorHost: bruno
Password for https://bruno@ConnectorHost:
remote: User is not authenticated: User bruno doesn't exist.
fatal: Authentication failed for https://ConnectorHost/gD1/repo8/.

Create the missing user by running p4 user.

See p4 user in Helix Core Command-Line (P4) Reference.