:wa:
If you prayed in congregation and forgot to read tashahhud after second Rakat, that means you were the imam, right?
Sitting for Tashahhud and reading tashahhud is wajib and missing out a wajib requires Sajdah Sahw.
As far as I know, if you did not even make sajdah sahw then you will have to repeat the prayer. The scholars on board can confirm. @Huzaifah ibn Adam, @Aisha
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.