Each platform our game is on has unique and specific requirements that we have to comply with. One of those requirements is to control the amount of loyalty that a player can generate through gameplay. If you play and earn LPs in our other games, you might see the lock a little sooner. These caps help protect us and our reward partners from abuse (e.g., automated play, bots, etc...)

Once the checkmark is gone, you'll be able to earn LP again. It generally takes 24 hours for this to refresh, but in some instances it can take more or less time.
This is a feature that is regularly being fine tuned so what determines this cap can change regularly.