@Kevin_Vijver this app focusses on the Zigbee based Xiaomi / Aqara devices.
The Xiaomi Universal IR Remote Controller is a WiFi based device.
You could check if Xiaomi Mi Home app developer is able to add support for this device: [APP][Pro] Xiaomi Mi Home App
Alternative would be to use a BroadLink RM mini 3: https://www.gearbest.com/living-appliances/pp_357329.html?wid=1433363 which is supported by the Broadlink app: Broadlink App for Homey | Homey
