Utilize the [keys/query](https://matrix.org/speculator/spec/HEAD/client_server/unstable.html#post-matrix-client-r0-keys-query) endpoint to [request the device list](https://matrix.org/docs/guides/e2e_implementation.html#downloading-the-device-list-for-users-in-the-room) for users in a room.
Utilize the keys/query endpoint to request the device list for users in a room.