Uploaded build error: App thinning

[trevix]

Hello.
I have a published iOS and Android app named Referi, developed using OSX 26.5, LC 10.0.5(RC1).

Recently I uploaded with Transporter an update to App Store Connect, for internal tester, but the build and the following upload builds attempts to Store Connect, were always marked with the status "processing in progress" and cannot be downloaded to test users.

After numerous attempts and Apple support requests, I was able to talk on the phone with Apple support.
The operator told me that my build has a problem with App thinning and she sent me a link to this page: https://help.apple.com/xcode/mac/9.0/#/devbbdc5ce4f

My problem is that I don't understand what am I supposed to do with these informations. I hope someone can help me out with this.

Please note: these are the additions that I made to the updated build vs the published one:
- NFC reading of text from inside the app
- BLE (Bluetooth Low Energy) iBeacon listening (from custom BLE devices)
- The Android version of the same update does not have any problem and works well

Thanks for any help.
Trevix

[trevix]

This forum is increasingly looking like a self-analysis tool...

I found some armv7 code inside my extensions and thinking that this could be the problem, I removed it and reloaded the build to Test Flight.
Same result: the Transporter upload goes well but the status of the build does not make it available.

Still looking for an answer.
I wonder about the..."bitcode" factor. I don't even know what it is, but could this be of concern?