https://github.com/Maxmudjon/com.xiaomi-miio/blob/master/docs/obtain_token.md
Use any of these methods to obtain the device token for the supported miio devices.
Use one of these methods to obtain the device token for devices that hide their tokens after setup in the Mi Home App (like the Mi Robot Vacuum Cleaner with firmware 3.3.9_003077 or higher). This is usually the case for most Mi Home devices. The latest versions of the Mi Home smartphone app dont hold the token anymore so before you begin with any of these methods you will need to install an older version of the smartphone app. Version 5.0.19 works for sure with the 1st gen Vacuum Robot, for the 2nd gen (S50) you should try version 3.3.9_5.0.30. Android users can find older version of the app here.