Arch Linux

Since today I'm unable to clone anything from the AUR using my public key.

Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

The SSH client confirms the public key is rejected

$ ssh -v aur@aur.archlinux.org -o PubkeyAuthentication=yes -i ~/.ssh/Muflone\ per\ AUR4
OpenSSH_7.3p1, OpenSSL 1.0.2h 3 May 2016
debug1: Reading configuration data /home/muflone/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to aur.archlinux.org [5.9.250.164] port 22.
debug1: Connection established.
debug1: identity file /home/muflone/.ssh/Muflone per AUR4 type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/muflone/.ssh/Muflone per AUR4-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2
debug1: match: OpenSSH_7.2 pat OpenSSH* compat 0x04000000
debug1: Authenticating to aur.archlinux.org:22 as 'aur'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256@libssh.org
debug1: kex: host key algorithm: rsa-sha2-512
debug1: kex: server->client cipher: aes128-ctr MAC: umac-64-etm@openssh.com compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: umac-64-etm@openssh.com compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh-rsa SHA256:Ju+yWiMb/2O+gKQ9RJCDqvRg7l+Q95KFAeqM5sr6l2s
debug1: Host 'aur.archlinux.org' is known and matches the RSA host key.
debug1: Found key in /home/muflone/.ssh/known_hosts:26
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/muflone/.ssh/Muflone per AUR4
debug1: Authentications that can continue: publickey
debug1: Offering RSA public key: Muflone per Debian
debug1: Authentications that can continue: publickey
debug1: Offering RSA public key: Muflone pubblica
debug1: Authentications that can continue: publickey
debug1: Offering RSA public key: Muflone per Arch Linux
debug1: Authentications that can continue: publickey
debug1: Offering RSA public key: Muflone su GitHub
debug1: Authentications that can continue: publickey
debug1: Offering RSA public key: Muflone per SSH
Received disconnect from 5.9.250.164 port 22:2: Too many authentication failures
debug1: Authentication succeeded (publickey).
Authenticated to aur.archlinux.org ([5.9.250.164]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: channel 0: free: client-session, nchannels 1
Connection to aur.archlinux.org closed by remote host.
Connection to aur.archlinux.org closed.
Transferred: sent 3860, received 1844 bytes, in 0.0 seconds
Bytes per second: sent 66625569.7, received 31828381.0
debug1: Exit status -1