When we got our puppy, we signed up for the monthly AKC Pupdates (free, and I think they’ll sign up unregistered dogs, too). A couple things about housebreaking mentioned in the Pupdates were 1) it’s hard to re-train a puppy that’s already been trained to pads, and 2) if the puppy continues to eliminate in the crate (assuming a healthy pup, of course), try removing any cushioning, bed, towel, blanket – keep the pup in a plain crate to discourage using it as a potty.
Our young dog is the first time we’ve gotten a puppy that was pad trained (pads seemed practically wall-to-wall everywhere at the breeder’s). Have to say, it did take more housebreaking effort than any other puppy I’ve ever had – not that she was having accidents, as we tried our best to never give her the opportunity to have one, which was exhausting for us. My husband estimated to the puppy kindergarten trainer that we took her out 20 times a day, and I don’t think he was wrong.
IMO, the pads confuse them. She had never previously had to control herself for even a brief time, or ask to go out, so we had to take her out frequently to reinforce desired behavior. We did everything we could - carried treats on potty breaks, used command words, made a huge positive fuss while feeding treats for elimination, etc. We needed her to understand the need to communicate with us when she felt the urge.
Once, during a terrible thunderstorm with scads of lightning when she was quite young, she actually did ask to go out, but the conditions were too dangerous and I put a pad in her playpen. She went there, but I think it set her back. It wasn’t that I didn’t understand that she wanted to go out, but she might have thought I didn’t.
A friend successfully used the take a pad outside routine to help train his dachshund puppy. Didn’t work for us – there are too many distractingly exciting things outdoors here (horses! deer! birds! smells! sounds! plants! bugs!).