Hi everybody,

Thanks for all the feedback! I have not addressed all issues reported yet, but those are in my todo.

First for Android users some instructions you need to follow:

I had to make a change to build process which forces you to re-enable the MBraille accessibility service which is required for typing with TalkBack on.

What is it? There is a Restricted Setting for the test app.
This "Restricted Setting" behavior is a security feature introduced in Android 13 to prevent sideloaded apps (apps not installed via an official store) from using powerful permissions like Accessibility Services to scrape data or control your phone.

Will it be there if I download from the Play Store?

No. If a user downloads your app from the Google Play Store, the restriction is automatically removed. Android trusts the "session-based" installation method used by official stores. Since your testers are currently getting the APK via Firebase (sideloading), the system treats it as an "untrusted" source and triggers the greyed-out setting.

How to disable it for your app (Manual Bypass)

To test your service on that remote Samsung device, you need to manually "whitelist" the app in the system settings.

The "Magic" Steps for Samsung/Android 13+:

Trigger the error: Go to Settings > Accessibility > Installed Apps and tap on your app. You’ll see the "Restricted Setting" popup. Tap OK. (This step is required to "tell" the system you're interested in this app).

Go to App Info: Go to Settings > Apps > [Your App Name].

The 3-Dot Menu: Look at the top right corner. You should now see a three-dot menu (⋮).

Note: If the dots aren't there, you skipped Step 1.

Allow Restricted Settings: Tap the dots and select "Allow restricted settings". Authenticate with the device PIN if prompted.

Enable the Service: Now, go back to Settings > Accessibility > Installed Apps > [Your App]. The toggle should no longer be greyed out, and you can turn it on.

Let me know how it goes.