The Telegram bridge is based off of SijmenSchoon/telematrix and has a little bit of setup to get it working in Matrix:
/aliasin Telegram. This will give you a Matrix alias that we'll use in a moment.
TheAliasFromEarlieris the alias from step 2
Telematrix is a third-party bridge not maintained by t2bot.io/turt2live. To learn more about the bridge, or to contribute, please see SijmenSchoon/telematrix on Github.