Problem pairing Pokémon go plus with iPhone 7 plus

Ive been playing this game since it came out I bought the Pokémon go plus 3 months ago along with a Samsung G7 it paired fine. Got the iPhone 7 plus and the Pokémon go plus will not connect to it. I would to use my watch since I paid for it. Please fix

Fressss2323332 about Pokémon GO, v1.31.0