[opensuse-buildservice] refreshed key is not published

The key below 'home:olh' expired a few day ago. I ran 'osc signkey --extend' to fix it, and 'osc signkey home:olh | gpp' shows that it appearently worked fine. But still zypper reports an expired key in my TW installation. Neither 'zypper clean -a' nor 'find /var/cache/zypp -type f -delete' help. Is ther anything else that needs to be done to use and/or publish the updated key? Olaf