How to connect the Xiaomi Smart Ceiling Light D20 to the voice assistant?

For your reference, here are the connection methods:
1. Connecting the product with Google Assistant
(1). Open the Google Home APP and go to the Device page;
(2). Tap [Add];
(3). Tap [Works with Google Home], search for Xiaomi Home, tap Xiaomi Home, and follow the instructions to log in to your Xiaomi Account and link your product with the Google Account.
Note:
Please refer to the specific operating instructions for the current version of the Google Home APP, as it could undergo periodic updates that introduce new features and improvements.  
2. Connecting the product with Amazon Alexa
(1). Open the Amazon Alexa APP, and tap [More];
(2). Tap [Skill & Games], search for Xiaomi Home, select the right skill, tap [ENABLE TO USE] and log in with your Xiaomi Account;
(3). After successful connection, follow the on-screen instructions and then you can control the product from Amazon Alexa.
Note:
Please refer to the specific operating instructions for the current version of the Amazon Alexa APP, as it could undergo periodic updates that introduce new features and improvements.