My poodle will not potty at home . Why !!!!

[Wakawakajas]

Hi. I recently bought a new adult poodle home . His previous owners are good to him, and I assure that I see him potty in his play pan there . But when I bring him home I realise he did not potty at home at all. I have to bring him down twice a day. I'm worried about his health where he need to stop himself from potty. I also try to buy the training aid spray to drop on newspaper but he did not even sniff. Why !
Experienced owners please teach me why to do, I've never deal with dog that don't pee at home