Desktop apps are not the ones where you create Telegram account; you only authorize them.
For another example, Threema, which is E2EE by default, doesn't allow more than one device with the account (to use multiple devices, you must create several accounts, one for each device and link them, and then basically any chat is a group chat. For desktop use, the web client uses webrtc to talk to your device to use it as a proxy).