If you use multiple Google Accounts on your device, you may encounter a situation where your Subscription does not indicate that it is valid. This is a long-standing issue for Google, and it's something we're tracking, but there is little we (or any app developers) can do.
We can offer a workaround though: Very rarely there is a bug with the Play Store App. This happens when the Play Store app doesn't report that there are purchases and this can have multiple reasons (most likely because you have multiple Google accounts on your phone).
Try this:
- Uninstall Bria Mobile
- In a BROWSER on your desktop: Log in to the web interface of Google Play with the account you used to purchase your subscription
- Install Bria Mobile from the web interface to your device. Don't let it open the Play Store app, but use the install button and choose your device in the browser.