Don't be surprised by “reversions." Your puppy may revert to eliminating inside again after you thought he was trained. This can happen for a number of reasons, such as sexual maturity, change of routine, curiosity overwhelming the need to go at the usual time, etc. Resume the consistent routine you used to housebreak your puppy. He will quickly start obeying the routine again. https://www.labradortraininghq.com/wp-content/uploads/2014/03/when-to-start-training-a-puppy-1.jpg
Whenever you’re training your dog, it’s important to get as many family members involved as possible so everyone’s on the same page. If you are telling your dog “off” when he jumps on the couch and someone else is saying “down,” while someone else is letting him hang out up there, how on earth is he ever going to learn what you want? Consistency will be the key to your success.
Just as a child needs a caring parent; an athletic team needs a coach; your puppy needs a leader and a clear social hierarchy. If you do not take up the role of leader, your dog will; and you will end up with an unruly, disobedient dog. Many people try to win their new puppy's love by letting the puppy always have its way. Buckets of affection is a wonderful thing for most puppies, but it must be tempered with respect.