How to activate the pro version on a second phone or after factory resetting

[Giobax]

Hello. I bought the Pro version on November 11, 2017 and to date I have installed it on all the Android smartphones I have had. Unfortunately, on the Samsung Galaxy A14 model that I now have, the indicated version is always "trial" and if I click on the "buy" button I get the error message "you are the owner of the app". I tried turning off the smartphone and reinstalling the application several times but I was unable to reinstall the "pro" version. What can I do?

Giovanni.