Call of duty black ops 4 crashes after every match

From the Activision site here are some things you can do to troubleshoot your issues

Most game crashes on Xbox One occur while in the Public Multiplayer Lobby before a match begins or immediately after a match ends. When a game crashes on Xbox One, you will normally get sent to the Xbox One dashboard, where you can simply restart the game
and attempt to play again. However, if game crashes persist, there are measures you can take to reduce the chance of game crashes.

Is your system software up to date?

The best way to avoid game crashes or freezing is to make sure the software on your Xbox One is up to date. Follow the steps below to check for updates.

1. Select the Home button in the center of your controller.
2. Select Settings.
3. Select System.
4. Available updates will be listed under Console info.

Is everything else in good working order?

If your Xbox One is up to date, try the following troubleshooting tips:

• Check your game disc for abrasions, scratches, or dust. If the disc is dirty, clean it with a soft cotton cloth dampened with water. Wipe the non-label side from the center straight out to the edges. Be sure your disc is completely dry before inserting
  it back into your Xbox One.
• Ensure your Xbox One console is in a cool, well-ventilated place.
• Clear the cache on your Xbox One.
• Try the game on another Xbox One. If the same problem occurs on another Xbox One, the problem is most likely with the game disc itself. If this is the case, you can
  
  request a replacement game disc.

Hope this helps, Happy gaming!

was it there at one point ?

I almost sure it was, and these days it´s not: "Call of Duty®: Black Ops 4 no está disponible actualmente." in english: "Call of Duty®: Black Ops 4 is not currently available."
https://www.microsoft.com/es-ar/p/call-of-duty-black-ops-4/c19n0723phfl?activetab=pivotverviewtab .

And black ops pass IS availavle in argentina: https://www.microsoft.com/es-ar/p/call-of-duty-black-ops-4-pase-black-ops/bqv9xcx5h9v9?activetab=pivotverviewtab

I spent most of my time playing:

Red Dead Redemption 2

Forza Horizon 4

Call Of Duty: Black Ops

Crash N'Sane Trilogy

Crash Team Racing

1) Call of Duty Black Ops 2

2) Call of Duty Modern Warfare 3

3) Call of Duty Black Ops

4) Call of Duty Modern Warfare 2

5) Call of Duty World at War

6) Call of Duty 4

7) Call of Duty 3

8) Call of Duty 2

9) Call of Duty

10) Call of Duty Elite

For info on how to receive the beta after preorder:
https://support.activision.com/articles/en_US/FAQ/Call-of-Duty-Black-Ops-4-Private-Beta-Code-Support...