When can you not tech a throw?

This is a hard one to look up but based off my experience its when you get thrown in recovery frames. Is this true?

If it is, is it possible to have a window to tech a throw afterwords or are you just guaranteed to get a throw off during recovery frames?

Yes, you are guaranteed a throw during the opponent’s recovery frames or if you manage to throw them during an attack.

Teching a throw is just like any other input. You have to be in neutral first before it actually comes out. That means no throw techs during recovery, active or start-up frames.