I'm getting the same issue, all metadata downloads are failing for me from within the Calibre library. Running the same google query in a browser works ok
eg from log
calibre, version 9.16.0
ERROR: No matches found: <p>Failed to find any books that match your search. Try making the search <b>less specific</b>. For example, use only the author's last name and a single distinctive word from the title.<p>To see the full log, click "Show details".
Running identify query with parameters:
{'title': 'The Family Cross', 'authors': ['James Patterson'], 'identifiers': {}, 'timeout': 30}
Using plugins: Amazon.com Multiple Countries (1, 0, 0), Google (1, 1, 4), Amazon.com (1, 3, 19)
The log from individual plugins is below
****************************** Amazon.com Multiple Countries (1, 0, 0) ******************************
Found 0 results
Downloading from Amazon.com Multiple Countries took 5.2723448276519775
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) PowerShell/5.1
Server: auto
Making google query:
https://www.google.com/search?q=Fami...www.amazon.com
Failed to find any results on results page, with title: Family Cross James Patterson site:
www.amazon.com - Google Search
No search engine results for terms: Family Cross James Patterson