There is currently a known issue with playing multiplayer games on iOS 9: at the moment, multiplayer does not work on iOS 9. We are working to fix this and will get an update released to the app store as soon as possible. Realistically, with the time required for the app approval process this will take a few weeks. For now, if you would like to continue to play multiplayer Nerts games, please consider postponing your upgrade to iOS 9.
We apologize for the inconvenience and thank you for your patience during this time. Thanks for your continuing support of Nerts!