The online function in "Strange Companion: Song of Ada" is a very fun special function in the game. To unlock the online function, you need to complete a mission cooperation license. There is no specific way to unlock the cooperation license. You just keep completing missions until the co-op license unlocks.
How to unlock the online function of Aida’s Song
The online function is not available at first. The game wants you to master its basic systems before it lets you team up with other players. There is no strict time limit to unlock online. Instead, you need to complete a task - a cooperative license.
There is no specific way to unlock the co-op license. You just keep completing missions until the co-op license unlocks. This quest is issued by the association headquarters, but you may need to complete quests from other organizations before you can obtain it. Once unlocked, you should already have a clearer understanding of the overall flow of the game.
If a lock icon appears next to an organization, it means you must complete other tasks before you can unlock the organization.
After completing the cooperative license task, the online function is unlocked. Online is not an independent system, nor is it a function where you can directly form a team, but you still need to perform tasks alone. If you meet other players in the world, you can send them a cooperation request through the emoticon menu. Up to three players can form a squad until they complete a given mission or choose to leave from the menu.