Reference

Stable codes.

Show snapshot.lastError or the thrown code. Do not invent a parallel protocol.

Code	Typical cause
`UNAUTHORIZED`	No session or expired session
`FORBIDDEN`	Authenticated but not allowed
`TENANT_MISMATCH`	Project / room belong to another tenant
`PROJECT_SUSPENDED`	Play and deploy are stopped
`ROOM_NOT_FOUND`	Room gone or never existed
`ROOM_FULL`	maxPlayers reached
`INVITE_INVALID`	Not a Loki-issued code
`INVITE_EXPIRED`	Code past TTL
`STALE_VERSION`	Host state / action version conflict
`HOST_REQUIRED`	Only the host may send this
`RATE_LIMITED`	Slow down
`QUOTA_EXCEEDED`	Account or project cap
`INVALID_MESSAGE`	Envelope failed schema
`UNSUPPORTED_VERSION`	Client/server protocol mismatch
`SERVICE_UNAVAILABLE`	Runtime not ready

SDK wrappers also use SynchronizedRoomError and RealtimeRoomError.