I can´t play a game that is already bought

Hi, I hope you're doing great out there despite the issue that you're experiencing. I am an Independent advisor and I am here to help you in regards to your concern.

If I may ask, what is the error that you're getting as well as the game that you're having an issue with?

Also, please make sure that you're signed in using the account where the game was purchased, to clarify simply sign in to https://account.microsoft.com/billing/orders.

Hi, people here do care. Did you by any chance remove your xbox from the preview program recently ?

Hi there, so have you done the usual restarting the console? If you have, make sure that you're signed in to the console using the same account you used to purchase the game. Also, make sure that the console is connected to Xbox Live. If you keep experiencing
the problem, contact Xbox Support.

More information and troubleshooting steps are here:
support.xbox.com/.../insert-disc-purchase-digital

Hi TerryMason, my name is Courtney and I would be happy to help.

I am very sorry that your grandfather is having this problem, with the intention of helping you I did an internal search in the community forum and found several solutions that were published by various users here in the forum, so I am going to share with you some steps that pertain to them:

The first thing is that On your Xbox, you must go to Settings > Network Settings > Advanced > Alternate MAC Address > Delete. Your Xbox will have to restart, and you will have to reinstall your campaign and multiplayer data packs, if the problem persists, let's move on to the other steps.

User DavidPhan4 mentions that by selecting the Packages option you can install all the content and hopefully this will solve the problem, to do this follow these steps:

1. Go to your COD MWF icon and click on the option button.
2. There will be an option called "Manage Package".
3. Click on that, and it will allow you to install the game content.

Information Source (Credits): https://answers.microsoft.com/thread/65d77661-70ed-4e2e-9261-6a8e572e2b04

As a last option and personal recommendation, you could tell your grandfather to restore the console, keeping the games and applications, this process will not delete any data from the console, it will only restore any corrupt files that are in the system, preventing its proper functioning (You just have to remember the credentials to log in again).

1. Press the Xbox button on your controller to open the guide.
2. Select Profile & system > Settings > System > Console information > Reset console.
3. Select Reset and keep my games and apps. This will reset the operating system and remove all potentially corrupted data without deleting your games or apps.

If the problem persists, uninstall and install the game again with all its packages. I hope this information has been useful to you and that you have a Merry Christmas.

Best regards,
Courtney.

Hello Undistinguished,

You need to set the console as your Home Xbox, after which any account on the console will be able to play your games.

Sign into your profile (and make sure it's the only signed in), then go to Settings and you can toggle the setting there for Home Xbox. Note: you can only change your Home Xbox designation three times in a 12-month period.

Let us know how you get on.