You may have experienced some iOS build server error messages today. Please wait to try to publish until further notice. The engineering team is upgrading the build server.
The engineering team was engaged in some routine maintenance and upgrading for the build servers. Sorry for any disruptions this may have caused users.
At this time 10:09 AM EST, the build servers should be live again for all users. If you are still seeing the error above, please wait a minute or two then refresh your browser and try again.