This information can be found in the "About" section in your game.
Your gamer tag is space and case sensitive. Please type it exactly as it is in your game.
To check, launch the Microsoft Store and verify the account that purchase premium is the account signed in.
To check, launch the Xbox App and verify the account that purchase premium is the account signed in.
This information can be found in your account order history here: For Windows (https://account.microsoft.com/billing/orders/), for iOS (https://support.apple.com/en-us/HT202039), and for Android (https://support.google.com/googleplay/answer/2850369?hl=en)
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