This s a revision from my earlier post. I used publication 523 as a reference source that never mentioned the term main home or principal residence.
Publication 701 does offer a clearer explanation on the ownership and use test and does specify main home as the residence that is eligible for the exclusion thus this does align with what PK mentioned.
Based on this, your European home would not qualify for the capital gains exclusion thus I apologize for my earlier advice.
{Edited 03/02/2022} 1:36 PM PST} @hindman203
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