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When using a free, public enterprise certificate, it frequently results into your device blacklisting the certificate or the certificate getting revoked.

If you open an app and see the "Unable to Verify App" ("An internet connection is required...") error, your device has blacklisted the certificate or the certificate, the app was signed with, got revoked.

This error indicates that your device does not permit opening these specific apps because of the invalid signature, not that the IPA you are using is flawed.

There are numerous methods for fixing this problem.

Easy and long term method on any iDevice or iOS/iPadOS/tvOS version

The best method to eliminate a blacklist and never worry about a revoked certificate again is by using your own certificate.

Single device / few devices:

You can buy a signing certificate for your device from here starting at 15.99€ with a full anti-revoke guarantee that makes your certificates way more stable than the free enterprise certificates.

It can be used to sign an unlimited number of apps using app signing tools or signing platforms like AppDB.

Many devices: You can also get one directly from Apple by enrolling in their Developer Program and creating a Developer Account.

Enrollment costs $99 per year, but it is a way to sideload while being absolutely certain that your license will never be revoked. You can also skip the enrollment at Apple and avoid ID/business verifications and other hassles that would also take up to several weeks and instantly buy your own verified developer account here - (Optionally anonymous)

Method which requires iOS 15.0-15.7.1 or 16.0-16.1.2) and only works if the certificate was not revoked.

Mac Dirty Cow (MDC) Compatibility: arm64 support for iOS 15.0 - 15.7.1 and 16.0 - 16.1.2

You can remove a the blacklist using either the BlackList or WhiteList apps on compatible iOS versions.

These apps remove the blacklist from your device by using the MDC exploit.

However, before you can use the app on your device, you must sign it.

A free Apple Developer account can be used with SideStore, AltStore, or Sideloadly.

All of these need a computer, but they all quickly remove the blacklist from the device. You can sideload BlackList however you'd like by downloading the IPA from here.

Open the app after installation, then select "Fix Blacklist."

The blacklist should now be removed, and you can use your apps again!

Extreme Method

If your iOS version is incompatible and you are unable or unwilling to pay for your own signing certificate, you can use the extreme method. 

All iOS versions should support this method:

Open Settings -> General -> Transfer or Reset iPhone -> Erase All Content and Settings

This will completely wipe your device clean, but it will also get rid of the blacklist file, allowing you to keep installing apps secured with free enterprise certificates.

All of your apps will need to be installed again!

Jailbreak Method (Advanced users only)

To do this, you need to jailbreak your device and have "Filza" or another root file manager app installed.

Use Filza go to

/var/db/MobileIdentityData/Rejections.plist 

/var/db/MobileIdentityData/AuthListBannedUpps.plist 

/var/db/MobileIdentityData/AuthListBannedCdHashes.plist