<p>Firstly, a purchase will be available on all devices logged into the same Google account, <em>if</em> (this is important) the app is installed via the same Google account too. You can select the account in the Play store app by tapping on the avatar at the top right, but only <em>before</em> installing the app. It is not possible to change the linked Google account after the app has been installed. Google doesn’t support moving a Play Store purchase from one to another account either.</p>
<p>Firstly, a purchase will be available on all devices logged into the same Google account, <em>if</em> (this is important!) the app is installed via the same Google account too. You can select the account in the Play store app by tapping on the avatar at the top right, but only <em>before</em> installing the app. It is not possible to change the linked Google account after the app has been installed. Google doesn’t support moving a Play Store purchase from one to another account either. This means you have to reinstall the app if it was installed under a different Google account.</p>
<p>Google manages all purchases, so as a developer I have little control over purchases. So, basically, the only thing I can do, is suggest some things:</p>
<ul>
<li>Make sure you have an active, working internet connection, and turn off any VPN based app because it might prevent the Play store from checking purchases</li>