IPA package cert


Hope someone maybe have some input on this

We have some 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.

We are using Intune with SCCM (hybrid) and SCCM I know very well how to deploy and stuff. But do any have some input how we should do this how we create our own cert.

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

Can any give some input on this ?

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 missing signing