Returns the online status and last seen timestamp for multiple users in a single request.

This endpoint is optimized for batch lookups when you need to check the online status of multiple chat counterparts at once.

<Note>Maximum 100 user UUIDs per request. Users who have disabled online visibility, and users you no longer have a live relationship with, always appear as offline with no last seen timestamp. An expired subscriber is only hidden when no other relationship survives — an active subscription, or a follow in either direction, keeps their presence visible.</Note>