Hi there,
It sounds like you just went a bit too fast from semi-neutral to npn-neutral space. Don’t allow them to keep trying to chase or scuffle in the cage as it can set things back, so separate them for now.
Cages are very territorial places and are not neutral, so they shouldn’t be together in the cage until they have spent 24-48 hours together in completely neutral space. It sounds like they are doing well together in the free-roam area. Could you set up a pen for them in that area (or even a more neutral area) and have them in the pen together for a couple days (with supervision!)? Or start by having them spent the night together in the pen with supervision, and try this a couple nights until you are ready to try for 24 hrs.
Kinda like making a friend… you might feel happy to hang out with them outside your home, but it can take time to want them to move in with you!
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.