Answer by TobiBS for change color of title in custom title page
If you want the title to take the fg and bg color of template title, you have to change the title page template, add a beamercolorbox, as in:...
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I'm using the custom title page shown in this SE post:\documentclass{beamer}\defbeamertemplate*{title page}{customized}[1][]{ \usebeamerfont{title}\inserttitle\par...
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