App installs on iPhone and simulator, but fails on iPad (iOS 18.7) — “Unable to install app. Please try again later.”

Hi everyone,

We had developed an iOS Application in Flutter and built it using XCode 26.0.1. We're unable to install this application in iOS 18.7. Below are the details,

➡️ Development Environment:

🔹 Flutter: 3.32.2

➡️ Build Environment:

🔹 Xcode: 26.0.1

🔹 Build system: Flutter → flutter build ios --release, then opened in Xcode for signing

➡️ Device models tested:

🔹 iPhone (iOS 15.8.3 / 15.8.5) → ✅ installs and launches fine

🔹 iOS Simulator (iOS 18.6 / 26) → ✅ works fine

🔹 iPad (iOS 18.7) → ❌ fails to install

➡️ Error message on iPad (iOS 18.7):

🔹 “Unable to install ‘<App Name>’. Please try again later.”

➡️ What we’ve tried:

🔹 Cleaned and rebuilt the project (flutter clean, DerivedData removed)

🔹 Deployment Target is set to iOS 18.7 or lower.

🔹 Built the app using an Enterprise distribution profile, not a Development profile.

🔹 Works fine on older iPhones (iOS 15.8.3 / 15.8.5), so signing seems valid

🔹 Device has enough storage, and trust is granted under Settings › VPN & Device Management

➡️ Questions:

🔹 Could this be related to iOS 18.7’s signing or compatibility change?

🔹 Are there any known issues with enterprise installs on iOS 18.7?

🔹 Any insight from Apple engineers or others who faced this with iOS 18.7 would be extremely helpful.

Thanks in advance!

App installs on iPhone and simulator, but fails on iPad (iOS 18.7) — “Unable to install app. Please try again later.”
 
 
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