Apple Arcade subscription not recognized on new iPhone

I just got the 17 pro this weekend and have Apple One on it (as I did in my old phone). Apple Music, TV+ and iCloud+ all work like usual, but Apple Arcade is telling me I need to subscribe to it (despite it working a few days ago on my old phone). How can I activate my subscription?

[Re-Titled by Moderator]

Original Title: Apple One confusion