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Re:The App Store turns 10 by kosinus on Thursday July 05, 2018 @01:59PM (#17465350)
Sounds like an issue with the app. Usually, apps have a 'redeem' button somewhere, that checks with the App Store to see if you did the purchase before, exactly for this scenario. (e.g. Monument Valley does this, and also some apps on macOS.)

I believe you can link maybe 5 devices to one account?

Re:The App Store turns 10 by badwolf on Thursday July 05, 2018 @02:27PM (#17465577)
Most likely an issue with the app. App Store guidelines require you to have a "restore my purchase" option.