Just transferring to the Android forum from the desktop one. Hopefully there is someone there that can help you.

Could you confirm a couple of questions please ...

What version of android is running on each phone? What version of Thunderbird for Android are you trying to install? Which store are you obtaining the app from?

S24 is version 16 XM-X700 is version 16

Hi David

Are you able to answer the last two questions please?

The app is generally compatible with Android 16.

Without knowing your app version and store it's obtained from, suggestions will be limited. If you manually downloaded the APK file, it's possible the download was incomplete/corrupted.

Have you tried downloading from an alternative source / store such as Github or F-Droid.

https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_14_0 https://f-droid.org/en/packages/net.thunderbird.android/

Getting app from Google App Store. Can't seem to find the version of the app ?? It's the app that comes up when you search (Thunderbird for android)

Thunderbird for android version 14.

I downloaded from Google Play. Never heard of the 2 you mentioned ???