Even though these air conditioners are Hyundai, the app used to manage them is named “TCL Home”.
So I suspect someone else manufactures these air conditioners, sells them to Hyundai, and TCL provides the smart functionality. This is the information of the AC.
I discovered that some of my AC’s are using a different model USB dongle. And from my research I found that this model is actually made by Tuya. Still though I can’t get the AC to connect to the Tuya app. It just can’t find the AC.