Unable to login with local user via ssh with error "input_userauth_request: invalid user"

Issue

• Unable to login with local user via ssh
• Found below errors from /var/log/secure

Apr  1 18:26:40 servername sshd[26386]: User testdev from x.x.x.x not allowed because none of user's groups are listed in 'AllowGroups'
Apr  1 18:26:40 servername sshd[26388]: input_userauth_request: invalid user testdev
Apr  1 18:26:40 servername sshd[26386]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=x.x.x.x  user=testdev
Apr  1 18:26:42 servername sshd[26386]: Failed password for invalid user testdev from x.x.x.x port 51470 ssh2
Apr  1 18:26:42 servername sshd[26388]: Connection closed by x.x.x.x

• Found following errors from /var/log/messages

Apr  1 18:14:18 servername sshd[20895]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=x.x.x.x user=testdev
Apr  1 18:22:48 servername sshd[24698]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=x.x.x.x  user=testdev