Potty training

Hello everyone! So I need help potty training my dogs I have three dachshunds we were doing fine while we lived in a apartment they would potty on doggy pads and when we would go outside no problem. Now we have a house with a backyard they love being outside and can spend almost all day outside but as soon and I bring them inside they will potty. They won’t even potty on the doggy pads anymore. What do y’all think? Are they trying to tell me something? I’ve used the same Walmart brand doggy pad from the very beginning. Feedback appreciated. Thanks