Forgive my ignorance, I don’t know much about that time period.
Here is a good thread from a year ago that answers your question.
It states that maces and hammers were used to crush armor, but also that they were easier to parry and read. Plate armor also has weak spots (joints and spaces between the armor, lighter bits of armor) that could be buckled or broken through. Daggers were also used to stab in close quarters between the armor.
There's a lot of good information that answers your question in there by u/wotan_weevil.
*Edit to give credit