To link Boosty to Telegram, go to Account Settings -> Connected Apps

You need to link your Boosty account to Telegram. To do this, go to your Boosty account settings -> Connected applications. Follow the instructions on the website. After linking, you will have a chat with the Boosty bot. Then you need to request a list of groups from the bot itself via the /my_chats command

Does not work via the mobile application, in this case, to link Telegram, you need to go to Boosty from the browser.