Error in Teams Bot when getting audio - MS Graph

Hi guys, I'm having issues using PsiBot project (https://github.com/microsoftgraph/microsoft-graph-comms-samples/tree/master/Samples/PublicSamples/PsiBot) as base. JUST happening on some MS accounts. When I'm trying to get audio from a Teams meeting using the bot I'm not getting any data, just silence.

public void Received(AudioMediaBuffer audioFrame)
{
	//Console.WriteLine("Receiving audio");
	if (audioFrame.Timestamp == 0)
	{
		this.logger.Warn($"Audio buffer timestamp is zero.");
		return;
	}

	var audioFormat = audioFrame.AudioFormat == Microsoft.Skype.Bots.Media.AudioFormat.Pcm44KStereo ?
		Microsoft.Psi.Audio.WaveFormat.Create16BitPcm(44000, 2) :
		Microsoft.Psi.Audio.WaveFormat.Create16kHz1Channel16BitPcm();

	var buffers = new Dictionary<string, (AudioBuffer, DateTime)>();
	try
	{
		unsafe
		{
			FileStream file = new FileStream(MediaFrameSourceComponent.BASE_PATH + "audio_" + callHandler.Call.Id + ".raw", FileMode.Append, FileAccess.Write);
			UnmanagedMemoryStream ustream = new UnmanagedMemoryStream((byte*)audioFrame.Data, audioFrame.Length);
			ustream.CopyTo(file);
			ustream.Close();
			file.Close();

		}
	}
	catch (Exception e)
	{
		Console.WriteLine("Error receiving audio" + e.StackTrace);
	}
}

This is the error log: 

This is the list of permissions the MS app has:

• Calls.JoinGroupCall.All
• OnlineMeetings.ReadWrite.All
• Calls.JoinGroupCallAsGuest.All
• Calls.AccessMedia.All

At this moment I don't have any clue because as I said before this is not happening in all MS accounts, just in a few ones.

Can anyone bring any idea?

Thanks