Apple Developer Profile Expired. As long as your developer id certificate was valid when you compiled your app, then users can download and run your app, even after the expiration date of the certificate. However, the profile expired on 4th august 2018 and the production application stopped working for all the users.
If it's apple's app store app, then it will still launch because it went through the extensive review process by apple before being uploaded to the app store. Apple doesn't warn you when your certificate expires, so the first thing you are hit with is an error telling you that your ipad doesn't have a proper profile installed on it. Perhaps this is apple’s way of ensuring that enterprise’s keep up with their $299 annual fee to keep their enterprise developer license.
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To login into the ios developer console goto developer</strong>.apple.com> and click account at the top. We used mdm to distribute the app to users. But if you want an app that doesn't expire, the only alternative for stock os ios devices is to have it approved by apple and then download it from the app store. Click on the profile to be edit.