Zotero 10.0.6 on macOS — sync connection error

I'm using Zotero 10.0.6 (ARM64) on macOS 27.0.1. Manual sync consistently ends with “Error connecting to server. Check your Internet connection.”
Zotero does not sync automatically either. The problem occurs both on my normal Wi-Fi connection and through a mobile hotspot. The Zotero website opens normally, and https://api.zotero.org/ returns “Nothing to see here.”
No system proxies are enabled. I also tested Zotero in Safe Mode, with the same result.
Debug ID: D1389754367
This started while I was cleaning up duplicate linked-file attachments in my library, but I don't know whether the two issues are related. The database integrity check returns ok.
Could you help identify the cause from the debug log?
Thanks, Luciano
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