I was stuck in "authentication failed" after finishing mozreview configuration due to setup with wrong bz.username=<my name which displays in bugzilla profile>. I think it should be documented explicitly with "bz.username (your bugzilla account email address)"
Oops! I found http://mozilla-version-control-tools.readthedocs.io/en/latest/mozreview/install-git.html#mozreview-install-git that has already described: $ git config --global bz.username firstname.lastname@example.org and I didn't aware of it. However, it would be better if we tell user that is your bugzilla account email address explicitly.
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