Sounds like the Dot in the kitchen was set up using a different account. If you have an Amazon household that's shared with members of your home, the Dot should/must be set up using the main account. If it was setup using a family member's account, it'll still work. But things like smart home devices, prime music, etc. will not be available. If that's the case, then you must deregister the Dot and set it up like it just came out of the box with your main account.