Migrate between bridge

I have been using the standard Philips Hue app on one bridge (B1), how do I move those lights over to hue essentials that are connected to a brand new bridge (B2)? I try to delete the light on my Philips Hue App without issue, but when trying to add/search for it using Hue Essential, it is not coming up. I try the Default “Search for lights,” but nothing. I then enter the 6 digital serial numbers into the “Enter serial number” field, and go up and click on “Search for lights”, still coming up with anything? Furthermore, both of the bridges resided in the same location, so distance shouldn’t be an issue