Subscription issue across two iPhones with the same account

I would like to subscribe. At the moment, I am still using the free version.

What I would like to clarify is the following: I have two iPhones, each with a different Apple ID. I would like to use the subscription on both phones.

What I do not understand is this: last year I created an account using my Gmail address on my private iPhone. Today, I installed the app on my business iPhone and logged in using exactly the same credentials, including the same Gmail address. However, on the app it shows “Member since January 2026”, while on my private iPhone it shows “Member since August 2025”.

Thank you very much.