401 on `/matchmaker/lobbies/find`

[Rivet] Starting client
[Rivet] POST https://api.rivet.gg/matchmaker/lobbies/find: { "game_modes": ["default"] }
[Rivet] 401: {"code":"CLAIMS_MISSING_ENTITLEMENT","message":"Token is missing one of the following entitlements: GameNamespacePublic","ray_id":"da9c834d-d0b7-4a91-82c7-ee2650fc08f3","documentation":"https://rivet.gg/docs/general/errors/claims/missing-entitlement"}
[MultiplayerManager::_lobby_find_failed] Lobby find failed: Request failed (401): {"code":"CLAIMS_MISSING_ENTITLEMENT","message":"Token is missing one of the following entitlements: GameNamespacePublic","ray_id":"da9c834d-d0b7-4a91-82c7-ee2650fc08f3","documentation":"https://rivet.gg/docs/general/errors/claims/missing-entitlement"}