Kindly refer to the following link(s):
When to do sujood as sahu behind the imam?
Forgot a Mandatory act (Durood) in Salah in congregation, what to do?
Imam forgets to make Sujood as Sahu for his mistake, is my prayer behind him valid?
Imam made a mistake in prayer (didn't sit for 1st tashahhud) but I didn't notify him