Having issues with Em or Am recognition in app? Please check the following playing tips:
1. Your fretting technique needs to be just right, so each note is clear. Pick each note in the chord one at a time to ensure that they all make a clear sound. It's very hard to hear the difference between playing it correctly vs incorrectly if you're strumming the whole chord.
2. Your strumming needs to be even across all the strings. Many people play the thicker strings quite hard and the thinner strings quietly or not at all, but if you can get the thinner strings to ring out too your chords will sound more balanced, so it's worth practicing strumming with even pressure all the way through. You can even exaggerate the thinner strings to get the idea.
3. Make sure your setup is good, that your guitar is tuned with the in app tuner and at a suitable distance from your microphone (not too close so it overloads). Please also check that the backing music is not too loud. If you're having trouble hearing the backing music then headphones can work well.
You can also check the following for further troubleshooting and these videos for tips on how to play them correctly: