Sometimes it can get tricky to launch FIFA 20, and it mainly stems from EA. The universal guideline to launch FIFA 20 is the following :
- Open the game in the Chrome browser (Incognito mode), make sure that only one browser tab is opened. Moreover, your browser should be updated to the latest version (> Help > About Google Chrome).
- In the Game Properties, remove the check - Enable Origin in Game (the screenshot below).
- After all the above-mentioned steps are complete, run the game, click on "PLAY" one time and wait (do not click multiple times).
Pay attention that Origin enables you to access FIFA 20 from 5 different devices per day. The same relates to other EA games.
Each newly created session on Boosteroid is perceived as the one from a new device, therefore, you can practically launch FIFA 20 only 5-times per day through Boosteroid.
In case your limit has already been used, we won't be able to help you here.
Moreover, there could be other reasons for the inability to launch EA games. One of the common, your account is temporarily or permanently blocked by EA itself.
This Answer HQ from EA may also be helpful to review.