Hi @jschmidb, so few thing here. Make sure you have the ssh key in fas, logout and login again into src.fedoraproject.org and last dont clone the repo as root but as a user.

Thanks! This brings me a bit forward!
- I saw that my ssh key is already set in https://accounts.fedoraproject.org/user/jschmidb/
- I logged in and out
- I switched user from root to local user jschmidb

Now I'm getting:
ImportError: Bad git executable.
The git executable must be specified in one of the following ways:
- be included in your $PATH
- be set via $GIT_PYTHON_GIT_EXECUTABLE
- explicitly set via git.refresh()

I'm running on fedora 35 and I have git installed (/usr/bin/git)
/usr/bin is already contained in $PATH and I also did an
export GIT_PYTHON_GIT_EXECUTABLE=/usr/bin/git

But still getting this error.

I have never seen something like this. Where are your python packages comming from? Are you using pip to install them or fedora repos?

As far as I can recall I installed python just via dnf install

Does 'fedpkg --debug clone libzpc' give any more info?

I finally created a new RSA key via ssh-keygen and copied the public key into my account at fedoraproject.org. This solved the authentication problem.
Thanks for all of your help!