How do you connect a used Hue Bloom lamp to a different Hue bridge

I bought a second hand Hue Bloom Table lamp & my hue bridge does not pick it up I read it was due to belonging to its previous set up. I tried connecting it via the app using the 6 digit Serial Number but it on the bloom the Serial number is longer than 6 digit. Does anyone know how I can reset the Hue Bloom? Or any other way I can connect it to my hue bridge? Thanks

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