The problem is that the long form used in the list of acronyms is the same as the long form used in the text. In the list, it is fine to capitalize the first letter of words, but in the text, I want the long form to be set in small letters.
I tried using
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\renewcommand{\acffont}[1]{\MakeTextLowercase{#1}}
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! Missing \endcsname inserted.
\MakeTextLowercase
with, for example, \textsc
everything would be fine.