The issue is a consistent failure during colocation room sharing (ShareAsync) with error statusInt = -1006 ("Host failed to share rooms with group") on specific account and device combinations. The failure occurs during hosting, before any client joins, and is not related to joining or synchronization. The issue persists across different headsets and accounts, with only one setup (main account on main headset) working reliably. Standard setup requirements such as App ID, release channels, Data Use Checkup, permissions, and spatial setup have been verified. The problem may be related to Shared Spatial Anchors or colocation building blocks.