Mac M1 can't install etcdtool through brew

[most01]

eden@edendeMacBook-Pro etcdtool % brew tap mickep76/funk-gnarge
fatal: not in a git directory
Warning: No remote 'origin' in /opt/homebrew/Library/Taps/homebrew/homebrew-services, skipping update!
==> Tapping mickep76/funk-gnarge
Cloning into '/opt/homebrew/Library/Taps/mickep76/homebrew-funk-gnarge'...
Username for 'https://github.com':
Password for 'https://github.com':
remote: Repository not found.
fatal: Authentication failed for 'https://github.com/mickep76/homebrew-funk-gnarge/'
Error: Failure while executing; git clone https://github.com/mickep76/homebrew-funk-gnarge /opt/homebrew/Library/Taps/mickep76/homebrew-funk-gnarge --origin=origin --template= exited with 128.

Mac can't install etcdtool through brew, why do I need a github account and password to install it, and I can't use my own github account and password