If you are in the situation where you can't attack a player, can be one of the following situation:

• One common reason is that the player is much weaker than you. The game limits attacks against players with far fewer Valor Points in order to protect smaller players. If the difference is too large, your army may refuse to attack or the attack will be restricted.
• Another possible reason is that the player is under protection. Some players may have a temporary shield or protection period that prevents others from attacking them.
• It can also happen if your own protection is active. When certain shields or protections are enabled, you may not be able to send attacks until the protection period ends.

If none of these situations apply, try restarting the game and attempting the action again. If the issue continues, you may need to contact the game’s support team for further assistance.