Given the significant difference in weight between the camera and the eyepiece, it's not a surprise that the planet doesn't appear on the screen when you change over. There will be a slight shift in angle that the OTA is pointing, which is enough for a tiny target like Uranus. Maybe try on a larger target like Jupiter and see how much of a shift you get.
I don't even try with an eyepiece any more, rather I just try to align the finder as best I can with the camera, then once I'm pointing at the planet with the finder, just slew around until it comes up on the screen. Neptune is much harder, as it's rarely visible in the finder in the suburbs of Melbourne.
Andrew
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