@some_ent Is not an expected behavior, you should be able to restore your purchases on any other device. Please check on your iPhone settings, that you have the same Apple ID on all your devices on the App Store section.
hello @cloudStreamPlay I upgraded the app to PRO using one of my devices. But now, when I try to restore the purchase using the same ID but a different device, I see an error saying "No purchase items to restore". Is this expected?