Logcat says "GStreamer: Could not retrieve class org.freedesktop.gstreamer.GStreamer"

[jnsw]

10-14 04:46:23.563 7019 7043 I Unity : initializing gstreamer 10-14 04:46:23.563 7019 7043 I Unity : GStreamerCore:Ref() 10-14 04:46:23.563 7019 7043 I Unity : CustomSBSPipelinePlayer:Start() 10-14 04:46:23.563 7019 7043 I Unity : 10-14 04:46:23.591 7019 7043 E GStreamer: Could not retrieve class org.freedesktop.gstreamer.GStreamer

I used the Android Library ARM64 from MRTunnelingPico (like mentioned here and want deploy the project for evaluation on a S20+ with Unity 2021.3.31f1. I am using the Scenes from https://github.com/mrayy/mrayGStreamerUnity/tree/master/Unity/UnityTests/Assets/Scenes

But I am getting the log above, what am I missing?

[jnsw]

I tried it now on my Quest 2 to but it states:
10-17 01:01:05.682 20270 20298 E Unity : EntryPointNotFoundException: Unable to find an entry point named 'mray_gst_customPlayerBlitImageNativeGLCall' in 'GStreamerUnityPlugin'. Tried the following entry points: Unable to get function 'mray_gst_customPlayerBlitImageNativeGLCall' because of 'The requested function was not found (0x06000001) dlerror() = undefined symbol: mray_gst_customPlayerBlitImageNativeGLCall

But I am getting the log above, what am I missing?