Yes, you can stream on Twitch at 2 Mbps, but the quality of your stream may be affected by the lower bitrate.
The recommended bitrate for streaming on Twitch varies depending on the video resolution and frame rate, but generally, a bitrate of at least 3 Mbps is recommended for 720p video at 30 frames per second, and a bitrate of at least 6 Mbps is recommended for 1080p video at 60 frames per second.
Streaming at a lower bitrate may result in a lower quality stream with more compression artifacts and reduced detail in the video. However, it can also help to reduce buffering and prevent dropped frames if you have a slower or less stable internet connection.
If you are streaming at 2 Mbps, it is recommended to use a lower video resolution and frame rate to reduce the strain on your internet connection and ensure a smoother streaming experience. You can experiment with different settings to find the best balance between video quality and performance for your particular setup.