We have some external IOS app developers who have made a app for IOS (IPA package). They have send the IPA file to me, and they have signed it with their own developer certificate - and say that we must sign it with our own, before we can deploy it.
Should we as company just sign up for a developer app and then re-sign it or what must be used ? It must be noticed, the App must not be on "app store". It is a local company app that we want to deploy to company phones etc, so outside App store
Another note. I tried to put the Ipa on a phone through apple configurator 2. It install, but afterwards the icon stay "grey" - and when trying to click on it, the error comes that the application cannot be installed. Must the app not work through apple configurationer with manual installation ? - or has this also something to do with the developer signing etc ?