I created a camera, which I want to render only my UI. When I play I don't see the UI in gameplay, but if I change a value in clipping planes or disable the camera and activate it the UI appears, however when I turn off the play the UI disappears again. All children in the canvas have the UI layer
I'm not at my pc at the moment so I won't be able to test this. But some pointers I'm using for UI Rendering
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My first reaction was towards your near plane
being placed 90 units away from the camera. Usually I prefer to go within 0-1 since I most likely want to render things above 1.
Secondly I usually recommend to go with Screen space -Overlay
if you only have one UI camera.
Hope this information helps you :)