Are you trying to do a Kindle Action (feature) using the Calibre Viewer?
I can move this thread to Viewer for you
But I think the Viewer is not an Kindle emulator. For that you probably will have to use the Kindle app and configure Preferences: Behavior (right side) to NOT use the internal viewer for the AZW or Mobi types.
OR
Set up Open With to use the Kindle app, then yo right click the Calibre book entry: Open With
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