I did just hear "il a fait une erreur" and I thought it was pronounced as:
Il a fet une erreur
But the voice I hear is:
Il a finerreur
fin in my ears?
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The most common pronunciations in France are:
[ilafɛ ynɛʁœʁ] (ilafè unèreur)
[ilafe yneʁœʁ] (ilafé unéreur)
The liaison is possible [ilafɛtynɛʁœʁ] (ilafètunèreur) but extremely rare in casual French and still uncommon in formal French. An exception would be a French language teacher providing hints to schoolchildren during a dictée.
When the sentence is spoken quickly, the initial I can be slightly or significantly dropped and the U can be soften and often turned into a "schwa".
This seems to be what your heard as "Il a finerreur".