Share Lifetime Premium on other device

So i bought the lifetime Audiorelay on my Samsung Galaxy S10, to use it on my desktop PC.
Really satisfied of the app, but i screwed with my jack port and now it doesn’t work anymore.
So i thought about using an used other phone just as an audio interface to plug in my earset, but i cannot find a way to restore premium on the other phone.
The button that i guess, is supposed to fulfill that job is not working with me.

Can i have support for that please?

If you’re logged in with the same Google account, it should work as premium without any issues.

Make sure it’s the same account and that your purchase history matches your Google services.