Tracker Overview
There are two plugins available for using tracker in Unreal Engine. One is ViveOpenXR plugin downloaded from VIVE developers website, another is OpenXRViveTracker plugin which is built-in when installing the Unreal Engine. Please refer to the following table and instructions to use the plugin.
| Platform | Headset | Supported Tracker | UE Plugin | |
| PC | PC Streaming | Focus 3/ XR Elite/ Focus Vision | Wrist Tracker Ultimate Tracker | Vive OpenXR OpenXRViveTracker (UE built-in) | 
| Pure PC | Vive Cosmos | Ultimate Tracker | Vive OpenXR | |
| Vive Pro series | VIVE Tracker | OpenXRViveTracker (UE built-in) | ||
| Ultimate Tracker | Vive OpenXR OpenXRViveTracker (UE built-in) | |||
| AIO | Focus 3/ XR Elite/ Focus Vision | Wrist Tracker Ultimate Tracker | Vive OpenXR | |
VIVE Tracker

Plugin: OpenXRViveTracker plugin (UE built-in)
Target Platform: Pure PC
Tutorial: How to use Vive Trackers in UE 5.2 and later versions
VIVE Ultimate Tracker

1. Plugin: ViveOpenXR plugin
Target Platform: AIO & PC  
Tutorial: VIVE OpenXR Tutorial - Ultimate Tracker
2. Plugin: OpenXRViveTracker plugin (UE built-in)  
Target Platform: PC 
VIVE Streaming Hub setting: Must check "Emulate VIVE Ultimate Tracker as VIVE Tracker"  
Tutorial: How to use Vive Trackers in UE 5.2 and later versions
VIVE Wrist Tracker

1. Plugin: ViveOpenXR plugin
Target Platform: AIO & PC streaming
Tutorial: VIVE OpenXR Tutorial - Wrist Tracker
2. Plugin: OpenXRViveTracker plugin (UE built-in)  
Target Platform: PC streaming
VIVE Streaming Hub setting: Must uncheck "Use VIVE Wrist Tracker for hand tracking" and check "Emulate VIVE Wrist Tracker as VIVE Tracker"  
Tutorial: How to use Vive Trackers in UE 5.2 and later versions