Videoplayer not playing on Android 10

I'm new on Unity, and I built my first 3D app, whith a VideoPlayer playing .mp4 files from http url on a Render Texture, exactly as described in Unity documentation (https://docs.unity3d.com/2020.1/Documentation/Manual/VideoPlayer-MigratingFromMovieTexture.html). The App runs perfectly on Windows standalone (my pc), not on Android 10 (the only smartphone I have). The texture remains black, the VideoPlayer status is "not playing". I don't have enought knowledge to investigate where is the problem. It seems to be a well know issue, but I spent a lot of time searching on google without success. Any suggestions? Thanks I