Background import stopped working on Android

Hi,

I have been using Lightrom app on an Android phone for a few months, with auto import enabled and an album selected as import destination. Until a couple of weeks ago, it's been importing photos from my smartphone in background (i.e. without having to open the Lightroom app). Recently I realized that, since a couple of weeks ago, no photo was imported from the phone, neither in background not by opening the Lightroom app.

Trying to solve the issue, I did the following:

a) delete all Lightroom data from the phone, log in again and re-enable auto import => no changes

b) create a new album as set this as auto-import destination => photos from the phone camera are now imported if I open the lightroom app, but still no import happening in background

Can anybody help please? I am out of clues.

Thanks

Gianuca