Yes, it's a super-annoying problem with how Google accounts are managed on Android and the Play Store app. Other apps/developers are affected the same way as you can read here: https://stackoverflow.com/questions/44397765
FLS Why cant I have an account in the Diarium app and buy pro for that account?
Because creating an account system that I have to manage comes with a lot of extra work on my side. I need to set up, maintain for such a system, pay for the server costs, need to make sure the servers are always available, etc etc. I don't want to get into this.
And don't we all already have enough accounts? 😉
FLS After some days there is no pro version anymore in my Diarium app now. What can I do now?
What account is set as your primary account on Google Play? The account you bought the app with?
Also how many days exactly are "some days"?
Can you perhaps send me a mail regarding this issue?