Who can earn Global drops
The official page says rewards are available to AION 2 Global server players. Korea and Taiwan server players are not eligible for these Global campaigns.
Link and watch
Use the account-linking controls on the official Drops page. Steam players should select the Steam option when linking. Watch a participating channel while the campaign is active.
Claim the reward
When the requirement is complete, claim the Drop from the Twitch Drops Inventory before the campaign claim window ends. Contact official support if a claimed Global reward does not arrive.