cannot create DM room

[fidoman]

Hello, trying to create room to send messages to user
~/matrix-commander-rs -d --room-dm-create @username:myserver.com

Creating aliases is really disabled on server, but doing same with matrix-commander is succesful.

2025-01-23T10:27:35.626159Z DEBUG matrix_commander_rs::mclient: Creating room(s)
2025-01-23T10:27:35.626167Z DEBUG matrix_commander_rs::mclient: Creating room(s): dm true, u ["@username:myserver.com"], a [], n [], t []
2025-01-23T10:27:35.626179Z DEBUG matrix_commander_rs::mclient: Creating room(s): dm true, u ["@username:myserver.com"], a [""], n [""], t [""], num 1
2025-01-23T10:27:35.626192Z DEBUG matrix_commander_rs::mclient: In position 0 we have user "@username:myserver.com", alias name "", room name "", room topic "".
2025-01-23T10:27:35.698075Z ERROR matrix_commander_rs::mclient: Error: create_room failed, reported error Http(Api(Server(ClientApi(Error { status_code: 403, body: Standard { kind: Unknown, message: "Not allowed to create alias" } })))).
2025-01-23T10:27:35.698101Z ERROR matrix_commander_rs: Error: crate::room_dm_create reported Create Room Failed