Is there a way to access the Pixel Data of an UARTexture?

I am trying to use the raw pixeldata of an UARTexture. I wrote a function, that does that with a UTexture, but when i try to call “GetRunningPlattform” on an UARTexture I just get a nullptr. I also tried to get the pixeldata over the FExternalTextureRegistry, by using the Guid, but I do still have no access to the pixeldata. Is there a way to achive this?

Thanks in advance!