If you have your teams window in a small size and then you add a tab for Dynamics you will see that the dynamics webpage fits perfect on the teams app, but if you go and maximze the teams app, the dynamics window inside of the teams app stays with the same heigth, the width autoadjust but not the heigth.

The problem gets fixed if you navigate to another tab or team and then go back to the dynamics tab, you will see the heigth is now the same as the teams app