Hi-The compact licensure rules are a little complicated, but here is my understanding of how they work:
You must apply for and receive a compact nursing license in the state that is your home state (the state where you have a driver's license, etc.) in order to qualify for "compact" privileges (if this state is a member of the compact)
Once this license is approved, you can practice in all 33 compact states with only one license ( Kansas and Louisiana will become compact on July 1, 2019, Alabama will become compact on January 1, 2020, and Indiana is still working on a start date)
If you change your legal residence from one compact state to another state that is also compact, you must reapply for a new license in this new state (ASAP). You can, however, still work in this new state with your old compact license, but just until your new license is approved.
If your state just became compact, and is not one of the original compact states, you must ask for, and submit the appropriate paperwork and a "compact fee" to get a compact license. This is not automatic. If your state did not previously require fingerprints and a background check for RN licensure, a compact license application does require both of these.