The issue was later fixed.
@All, we are working on fixing the issue. It will need a fresh build from us. It might take some time. Thanks.
Hmm. A member of my gang was reporting the same issue after updating his iPhone to iOS 10, but he claimed he was able to fix the issue by completely wiping and factory resetting his device. He was also able to access the app via notifications. (E.g., if a gang member would comment in the chat, he would be able to open the notification and then access the app.) However, like you, he was unable to access the app by simply opening it via the icon. I'm not sure why the update would have broken the app, but maybe you can access the account via some other method, enable notifications in the app settings, and then use notifications to access the app until DynamicNext rolls out a fix. You could also try the wipe and factory reset option, but that is a bit overkill, in my opinion.