APK file from MDK app, signature verification failed

[curtiskettler]

Hello,

I have an MDK application that I am trying to get running on a fleet of Android devices using an APK file. I have created the APK file using Mobile Build in Mobile Services. The build completes successfully with no issues. However when I try to install the file on my devices I get the error: "App not installed as package appears to be invalid".

I tried running the APK file in Android Studio on an emulator and I get the following error message:

There seems to be some issue with the signature but I can't determine what might be causing this. I have created APK files from Mobile Services in the past with no issues.

mobile development kit client SAP Mobile Platform Android SAP BTP SDK for Android 
@bill_froelich 

[bill_froelich]

What MDK Version are you building with in Cloud Build and what Android OS version is the device running?

[curtiskettler]

@bill_froelich the MDK version is 24.4 and the devices are running Android 10, 11, 12, 13, and 14 so I have set the minimum acceptable Android version to 9 when creating the build.

[Jakub_Szaek]

Have you been able to solve this issue? I have encountered it yesterday and so far no solution. I use signing profile generated in SAP mobile services (cloud build settings -> generate android signing profile)

[bill_froelich]

@Jakub_Szaek When you created your sigining profile in the cloud what expiration did you use?  There was an issue when using the default expiration of 25 years that could be worked around by selecting a lower expiration (like 24 years).  I would suggest trying that to see if it makes any difference.

[Jakub_Szaek]

I have tried 25, 24 and 1 year, none of them worked. I have fixed that issue via creating my signing in cmd: keytool -genkeypair -v -keystore my-app.keystore -alias my-alias -keyalg RSA -keysize 2048 -validity 10000. Generated signings for some reasons work in cloud build, but my android device (android 15) finds them as corrupted.