SUMMARY
Internet searches on the BoardGameGeek search source return an error.

STEPS TO REPRODUCE
1.  New Collection→New Board Game Collection
2.  Internet Search
3. Enter some term in the search box like "Monopoly" and hit Search

OBSERVED RESULT
Access denied to https://boardgamegeek.com/xmlapi2/search?query=battleship&type=boardgame,boardgameexpansion.

EXPECTED RESULT
A list of board games regarding "Monopoly".

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.3

ADDITIONAL INFORMATION
This worked a few months ago. Going to https://boardgamegeek.com/ in a browser and performing the same search there shows many matches: https://boardgamegeek.com/geeksearch.php?action=search&q=monopoly&objecttype=boardgame  Accessing the URL in the error message with curl shows a 401 ("Unauthorized") error, but that is expected because the API requires a Authorization: header.